AVITAR INC /DE/
8-K, 1999-07-14
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT

                     Pursuant to Section 13 or 15(d) of the
                        Securities Exchange Act of 1934


Date of Report (Date of earliest event reported) July 9, 1999

     AVITAR, INC.
- ---------------------------------------------------------------
    (Exact name of registrant as specified in its charter)



      Delaware                  0-20316        06-1174053
- -----------------------------------------------------------------
 (Sate or other jurisdiction   (Commission      (IRS Employer
 of incorporation)            File Number)    Identification No.)


  65 Dan Road, Canton, MA                              02021
- -----------------------------------------------------------------
(Address of Principal executive offices)          (Zip Code)

Registrant's telephone number, including area code (781) 821-2440

Item 2.  Acquisition or Disposition of Assets

On July 9, 1999 the  Registrant  acquired all the  outstanding  capital stock of
United  States  Drug  Testing  Laboratories,   Inc  ("USDTL")  in  exchange  for
approximately 2 million restricted shares of common stock of the Registrant. The
amount of  consideration  was  determined  by arm's length  negotiation  between
Registrant  and the  majority  shareholders  of USDTL,  taking into  account the
revenues and  prospects  for USDTL.  The  Registrant  acquired  the  outstanding
capital stock of USDTL from its shareholders  Veronica Lewis,  Douglas Lewis and
Christine Moore. In connection with Registrant's  acquisition of USDTL,  Douglas
Lewis and Christine Moore have entered into Employment Agreements.

Item 7.  Financial Statements and Exhibits.

(a) Financial Statements of businesses acquired.

   (4) The  financial  statements  of the  acquired  business  shall be filed as
Exhibits to an amended Form 8-K report on or before September 22, 1999.

(b) Pro forma financial information.

   (2)  The  pro  forma  financial  information  of the  acquired  business,  if
required,  shall be filed as Exhibits to an amended Form 8-K report on or before
September 22, 1999.

(c) Exhibits.

   (2)  Purchase  and  Sale  Agreement  (Dated  as of  June  30,  1999)  between
Registrant and shareholders of acquired business.




                                   SIGNATURES

     Pursuant to the  requirements  of the  Securities and Exchange Act of 1934,
the  registrant  has duly  caused  this report to be signed on its behalf by the
undersigned hereunto duly authorized.


                                              AVITAR, INC.
                                              (Registrant)


Date:     July 14, 1999                 By:
                                         ------------------------
                                        J.  C.  Leatherman
                                        Chief Financial Officer



EXHIBIT (2.0)
                           PURCHASE AND SALE AGREEMENT


                                      AMONG


                                  AVITAR, INC.


                                  DOUGLAS LEWIS


                                 VERONICA LEWIS


                                       AND


                  UNITED STATES DRUG TESTING LABORATORIES, INC.


                               WITH RESPECT TO THE


                       ACQUISITION OF ALL THE OUTSTANDING


                                CAPITAL STOCK OF


                  UNITED STATES DRUG TESTING LABORATORIES, INC.



                       -----------------------------------

                            Dated as of June 30, 1999
                       -----------------------------------




                         AGREEMENT OF PURCHASE AND SALE



          THIS  AGREEMENT OF PURCHASE AND SALE (the  "Agreement")  is made as of
the 30th day of June,  1999 among  Avitar,  Inc.  ("Avitar" or the  "Buyer"),  a
corporation  organized  and  existing  under  the  laws of  Delaware,  with  its
principal offices at 65 Dan Road, Canton,  Massachusetts,  02021,  United States
Drug Testing  Laboratories,  Inc. ("USDT"), a corporation organized and existing
under the laws of Illinois,  with its principal  offices at 1700 S. Mt. Prospect
Road,  Des  Plaines,  Illinois,  60018 and  Douglas  Lewis and  Veronica  Lewis,
individuals  (and husband and wife) with an address at 53 Yorkshire  Woods,  Oak
Brook,  Illinois 60521 (Mr. and Mrs. Lewis are sometimes hereinafter referred to
as the "Sellers").

                               W I T N E S S E T H

          WHEREAS,  Veronica  Lewis owns 550 shares and  Douglas  Lewis owns 450
shares,  in each  case of common  stock,  par value  $1.00 per  share,  of USDT,
collectively  constituting all of the issued and outstanding shares of USDT (the
"Shares"); and

          WHEREAS,  Sellers  desires to sell and Buyer  desires to purchase  the
Shares for the  consideration  and on the terms and conditions  hereinafter  set
forth;

          NOW,  THEREFORE,  in  consideration  of the  premises  and the  mutual
covenants and agreements,  and in reliance on the representations and warranties
herein set forth, Buyer and Sellers and USDT hereby agree,  subject to the terms
and conditions hereof, as follows:

                                    ARTICLE 1
                                Purchase and Sale

          1.1 Purchase of Shares.  At the Closing,  as defined  herein,  for the
Consideration  set forth in Section 1.2 hereof,  Sellers  shall sell,  transfer,
assign,  convey and deliver to Buyer, and Buyer shall acquire from Sellers,  the
Shares,  representing all of the issued and outstanding  shares of capital stock
of USDT,  free and clear of all liens,  encumbrances,  pledges and claims of any
kind. At the Closing,  Sellers shall deliver to Buyer,  against  delivery of the
Consideration,  certificates  evidencing the Shares accompanied by duly executed
stock  powers  or other  instruments  of  transfer  satisfactory  to  Buyer  and
sufficient  to transfer the Shares to Buyer,  together  with any required  stock
transfer tax stamps or cash in the appropriate amount in lieu thereof.

          1.2  Consideration  for the  Shares;  Issuance of Avitar  Shares.  The
consideration  ("Consideration")  for the Shares,  constituting  payment in full
therefor,  shall  consist of the  issuance  and  delivery by Buyer to Sellers of
2,062,570  shares of common  stock of Avitar,  Inc.  (collectively  the  "Avitar
Shares"), which include 31,570 shares for conversion of debt due to Sellers from
USDT with 1,123,243  shares issued to Veronica  Lewis,  919,017 shares issued to
Douglas Lewis,  and 20,310 shares issued to Christine Moore, all duly authorized
by Buyer.  (The Avitar Shares will be issued in certificates  as follows:  three
certificates  in the name of Veronica Lewis  representing  449,297,  449,297 and
224,649 shares;  three  certificates  in the name of Douglas Lewis  representing
367,607,  367,607  and  183,803  shares;  and two  certificates  in the  name of
Christine  Moore,  representing  10,155  shares  each.) At  Closing,  Buyer will
deliver to Seller, free and clear of all liens, encumbrances, pledges and claims
of any kind,  the  above-described  certificates  for the  Avitar  Shares  which
constitute  the  Consideration;  provided,  however,  that the Avitar Shares are
subject to all applicable  securities  laws and  regulations and that the Avitar
Shares may not be sold or otherwise  transferred  for one year after the Closing
Date and 50% of the Avitar Shares may not be sold or otherwise  transferred for,
two years after the Closing Date. Further,  twenty (20%) percent of the Sellers'
Avitar  Shares  will be held  pursuant  to the Escrow  Agreement  referred to in
Section 5.10.

          1.3 Sellers' Investment Representations.  Sellers acknowledge that the
Avitar Shares will not be registered  under the 1933 Act or any state securities
law.  Sellers are acquiring all the Shares for investment and not with a view to
distribution.  Any  certificates  representing  the Shares may be endorsed  with
appropriate  legends to reflect federal and state securities law restrictions on
transfers.

                                    ARTICLE 2
                         Representations and Warranties

          USDT and Sellers  represent  and warrant to Buyer and agree with Buyer
as follows, as of the date hereof and as of the Closing Date:

          2.1  Organization  and  Qualification.  USDT  is  a  corporation  duly
organized,  validly existing and in good standing under the laws of the State of
Illinois.  USDT has all corporate power and authority required for it to own (or
lease,  as the case may be) and operate its properties and carry on its business
as presently  conducted.  USDT is duly qualified or licensed to do business as a
foreign  corporation  in each of the  jurisdictions  in which the  character and
location of its assets or the nature of its business make such  qualification or
license  necessary.  There  is no  pending  or  threatened  proceeding  for  the
dissolution,   liquidation,   insolvency  or  rehabilitation  of  USDT,  whether
voluntary or involuntary.

          2.2 Corporate  Instruments and Records.  All accounts,  books, ledgers
and other records  material to the business of USDT of whatsoever kind have been
fully, properly and accurately kept and completed in all material respects,  and
there are no material  inaccuracies  or  discrepancies  of any kind contained or
reflected  thereon,  and they  give  and  reflect  a true  and fair  view of the
financial  position  of  USDT.  The  copy of  USDT's  articles  of  organization
certified by the Secretary of State of the State of Illinois, and of its by-laws
certified by its  Secretary,  furnished  to Buyer,  are correct and complete and
each reflects all  amendments  made through the date of this  Agreement.  USDT's
books,  stock certificate books and stock ledgers as made available to Buyer for
inspection,  were correct and complete as of the date of such  inspection and no
further  entries  have  been  made  in any of  same  through  the  date  of this
Agreement,  and each contains the true  signatures of the persons  purporting to
have  signed  them.  All  material  corporate  actions  taken by USDT  since its
incorporation  have been duly authorized or ratified by all appropriate  action.
There have been no material  corporate actions which,  consistent with customary
corporate  practice,  should  be but have not been  reflected  in the  corporate
minutes books and stock transfer  records of USDT delivered or made available to
Buyer prior to the Closing.

          2.3 Capitalization. USDT has an authorized capital of 1,000,000 shares
of common stock, no par value, of which 1010 shares are outstanding and owned of
record by Sellers,  and no shares are held in the  treasury of USDT.  All issued
and outstanding  shares of USDT are fully paid and  non-assessable  and have not
been issued in violation of any  pre-emptive  or other rights of any person.  No
other class of capital  stock of USDT is authorized  or  outstanding.  There are
neither  outstanding  nor  authorized  any  options,  warrants,  rights,  calls,
commitments, convertible securities, subscription rights, rights of exchange, or
other rights,  plans or other  agreements of any nature which will or may result
in the future in USDT being or becoming  obligated  to  purchase,  issue or sell
additional  shares of capital stock to any  individual  or entity  (corporate or
otherwise)  (collectively,  "Person").  There are no voting agreements or voting
trusts respecting shares of USDT's capital stock.  There are no shares of USDT's
capital stock reserved for issuance for any purpose.

          2.4 Subsidiaries. Except as disclosed on the Disclosure Schedule, USDT
does not,  directly or indirectly,  have any equity interest in any corporation,
partnership, association, trust, joint venture or other entity.

          2.5  Authorization;  Valid  and  Binding  Obligation.  USDT  has  full
corporate  power and  authority  to execute and deliver this  Agreement,  and to
consummate  the  transactions  contemplated  hereby and perform its  obligations
hereunder.  All  corporate  action  required of USDT in order to authorize  such
execution,  delivery and performance has been taken.  Sellers have full capacity
to execute  and deliver  this  Agreement,  and to  consummate  the  transactions
contemplated  hereby and perform their respective  obligations  hereunder.  This
Agreement  constitutes  the valid and binding  obligation of each of Sellers and
USDT  enforceable  against each in accordance  with its terms,  assuming the due
authorization, execution and delivery hereof by Buyer.

          2.6  Title  to  Shares.   On  the  Closing  Date,   Sellers  will  own
beneficially  and of record the Shares which will  constitute  all of the issued
and  outstanding  equity  securities  of USDT.  Sellers  have  good,  valid  and
marketable title to the USDT Shares, free and clear of all liens,  restrictions,
proxies, voting trusts, voting agreements,  encumbrances and claims of any kind.
At the  Closing,  Buyer will acquire  good,  valid and  marketable  title to and
beneficial and record ownership of the Shares.

          2.7 No Violation.  USDT is not in default under or in violation of any
provision of its articles of organization or by-laws. Seller and USDT are not in
default  under or in violation of any  agreement,  indenture,  contract,  lease,
sublease,   loan   agreement,   note   restriction,   obligation   or  liability
(collectively,  "Contracts") to which any of them is a party, or by which any of
them is bound or to which any of their assets are  subject,  in any respect that
could have a materially  adverse  effect on the assets,  business,  prospects or
financial  condition of USDT, or the ability of Sellers or USDT to perform their
respective obligations  hereunder.  The execution and delivery of this Agreement
by  Sellers  and  USDT,  and  consummation  by each of them of the  transactions
contemplated  by this Agreement will not (i) conflict with or breach or cause or
amount to any default or  violation of any of USDT's  articles of  organization,
by-laws or  Contracts,  or (ii) cause an  acceleration  or  cancellation  of, or
permit any Person to accelerate,  terminate,  modify or cancel any or all rights
under any such  Contracts  or (iii)  result in the  creation  of any Lien on the
assets  or  properties  of  Sellers  or  USDT.  Such  execution,   delivery  and
consummation  will not  violate  or breach  or  constitute  a default  under any
federal,  state or local laws,  rules or regulations or any judgments,  decrees,
injunctions   or  other  order  of  any  Regulatory   Authority   (collectively,
"Applicable  Laws") to which  Sellers or USDT or any of their assets is subject.
"Regulatory  Authority"  shall mean any court,  arbitrator or federal,  state or
local  government  or  any  department,  commission,  board,  agency  or  taxing
authority thereof.

          2.8  Consents and  Approvals.  No consent or approval of any Person or
Regulatory  Authority,  and no  approval,  order,  license,  permit,  franchise,
declaration  or filing of any nature is required as a result of or in connection
with the execution and delivery or this  Agreement or  performance  hereunder by
Sellers or USDT.

          2.9 Financial Statements. USDT and Sellers have delivered to Buyer (i)
the balance  sheet of USDT as at December  31,1998,  and the related  profit and
loss statement and supporting schedules and (ii) the balance sheet of USDT as at
May 31, 1999, and the related profit and loss statement and supporting schedules
(the "Financial Statements"). The Financial Statements are correct and complete,
and were prepared in accordance with generally accepted  accounting  principles,
applied on a basis consistent with prior periods,  except as noted therein.  The
balance  sheets and related notes of USDT  included in the Financial  Statements
fairly  and  accurately  present  the  financial  condition  of USDT as at their
respective  dates and the  profit  and loss  statements  fairly  and  accurately
present the results of USDT's operations for the respective  periods then ended.
The books and records of USDT  reflect all income and expense  items  (including
accruals) and all assets and liabilities in accordance  with generally  accepted
accounting principles applied on a basis consistent with past practice.

          2.10 Absence of  Undisclosed  Liabilities.  USDT has no liabilities of
any nature,  whether  absolute,  contingent or otherwise,  and whether due or to
become due, which are material,  singularly or in the aggregate,  to its assets,
business,  operations,  prospects  or  financial  condition,  except  (i)  those
disclosed or reserved against in the Financial Statements, (ii) those arising in
the ordinary course of business after the date of the Financial Statements,  and
(iii) those specifically identified on the Disclosure Schedule,  together with a
good faith estimate of the amount thereof.

          2.11 No  Adverse  Changes.  Except  for  events  contemplated  by this
Agreement or  disclosed on the  Disclosure  Schedule,  since  December 31, 1998,
there  has been no  material  adverse  change  in the  condition  (financial  or
otherwise),  properties, assets, liabilities,  rights, obligations,  operations,
business or prospects of USDT.

          2.12  Guaranties  and Security.  USDT has no liability as guarantor or
contingent obligor for any obligation of any Person.  Except as set forth on the
Disclosure Schedule, no assets of USDT are pledged,  hypothecated,  or have been
delivered for safekeeping or subjected to a security  interest or made available
in any way to secure  payment or  performance  of any  obligation of USDT or any
other Person.

          2.13  Tax Matters.

               2.13.1  Tax  Returns  and Tax  Payments.  (I)  All  tax  returns,
including estimated tax returns and information returns, required to be filed by
or on behalf of USDT and Sellers for any period  ending on or before the Closing
Date,  taking into  account any  extension  or waiver of time to file granted or
obtained on behalf of USDT (all of which extensions and waivers are set forth on
the Disclosure  Schedule)  have been timely filed or will be timely filed;  (ii)
all Taxes  shown as due on those  returns as well as all Taxes due to or claimed
due by federal,  state,  local or foreign  taxing  authorities,  with respect to
periods  ending on or  before  the  Closing  Date,  have  been paid or  adequate
provision  therefor  has been made;  (iii) the filed  returns are  complete  and
correct  in all  respects  and  USDT is not  required  to pay,  for the  periods
represented  by such tax  returns,  any Taxes  other than  those  shown in those
returns;  and (iv) the  provisions  for taxes in the  Financial  Statements  are
adequate to cover all accrued and unpaid Taxes as of the date thereof.  "Tax" or
"Taxes" means all federal, state or local income, gross receipts, excise, sales,
use, employment,  payroll,  franchise,  capital,  profits,  business,  property,
transfer,  intangibles or other taxes, fees, stamp taxes and duties, assessments
or charges of any kind whatsoever  (whether payable directly,  pursuant to a tax
sharing agreement and arrangement or by withholding), together with any interest
and any penalties,  additions to tax or additional amounts imposed by any taxing
authority with respect to the ownership,  operations,  business or properties of
USDT.

               2.13.2  Audits.  The federal  income tax returns of or  including
USDT have never been audited by the Internal Revenue  Service,  and there are no
pending  unresolved  issues with  respect to any Taxes  payable to any  federal,
state or local tax  authority.  USDT is not currently the subject of a tax audit
and neither has it been  notified by any taxing  authority  that it is to be the
subject of an impending tax audit. No extension or waiver of limitation  periods
applicable to audits or claims by any taxing  authority with respect to USDT has
been granted or will be requested.

               2.13.3 Tax Liens.  There are no tax liens imposed by any federal,
state or local taxing authorities outstanding against any assets of USDT.

          2.14 Litigation. Except as set forth on the Disclosure Schedule, there
are no actions,  suits,  proceedings  or  investigations  pending or  threatened
against or affecting  USDT, at law or in equity,  or by or before any Regulatory
Authority.

          2.15  Title to  Properties.  Except  for those  Liens set forth on the
Disclosure  Schedule and also  reflected on the Financial  Statements,  USDT has
good,  valid and marketable  title to all  properties  and assets  (tangible and
intangible) used in its business,  except for leased properties and assets.  The
fixed assets and all tangible  personal property owned by USDT are in a state of
good  maintenance  and repair and are adequate and suitable for the purposes for
which they are presently being used.  "Lien" shall mean any interest in property
(real,  personal or mixed) which either: (a) secures an obligation owed to, or a
claim by, a Person or  Regulatory  Authority,  whether such interest is based on
the common law,  statute or  contract,  and  including  without  limitation  the
security  interest  or  lien  arising  from  a  mortgage,  encumbrance,  pledge,
conditional  sale,  transfer  receipt,  security  agreement or other preference,
priority or  preferential  arrangement or from a lease,  consignment or bailment
for security purposes,  or (b) gives any Person or Regulatory  Authority a right
in or claim to any property.

          2.16 Real Property.  The Disclosure  Schedule sets forth a description
of each parcel of real property which USDT uses in its business or in which USDT
has an  interest  ("Real  Property"),  specifying  the nature of the right and a
brief description of the buildings,  equipment and fixtures located thereon, and
the relation to USDT's business.  USDT has, and after the Closing shall continue
to have, the legal right to use the Real Property as presently used.

          2.16.1  Compliance.  Except as set forth on the  Disclosure  Schedule,
neither  USDT nor the Seller has received  any notices of  violations  of law or
municipal ordinances, orders or requirements issued by any Regulatory Authority,
including  without  limitation  any  environmental  notices or orders against or
affecting  the Real  Property.  All such  notices of  violation of law have been
complied with prior to the Closing Date.

          2.17 Receivables.  The aggregate amount of USDT's accounts  receivable
outstanding  for more than  ninety  (90) days as of the May 31,  1999  Financial
Statements was $59,293, and as of the Closing Date, will not exceed $59,293, and
payments by  obligors on all USDT's  notes  receivable  (none of which  evidence
trade receivables except as disclosed on the Disclosure Schedule) are current in
all  cases as of the date of this  Agreement  and as of the  Closing  Date.  The
allowance for doubtful and uncollectible  accounts reflected on the May 31, 1999
balance sheet is and will be  sufficient on the basis of USDT's past  experience
to provide for losses that may arise in  collection  of those  accounts or notes
receivable.  Subject to this reserve and except as  disclosed on the  Disclosure
Schedule,  USDT's  accounts  receivable are good and collectible in the ordinary
course of business.  There is no reason to believe  that any of USDT's  accounts
receivable  or notes  receivable  is  subject  to any  counterclaim  or right of
set-off.

          2.18  Contracts.  All Contracts to which USDT is a party and which are
material to its business,  assets,  properties or prospects are duly and validly
executed by all parties, and are in full force and effect as of the date of this
Agreement  and the  Closing  Date and,  except  as set  forth on the  Disclosure
Schedule,  no party other than USDT has the right to terminate any such Contract
prior to its scheduled expiration.  No event has occurred which constitutes,  or
after  notice or the  passage of time,  or both,  would  constitute,  a material
default by USDT under any such  Contract  and to the best of each  Seller's  and
USDT's  knowledge,  no such  event  has  occurred  which  constitutes  or  would
constitute  a material  default by any other  party.  USDT is not subject to any
liability or payment  resulting from  renegotiation of amounts paid it under any
Contract.  None of such Contracts has or will involve access to, or the creation
of,  classified  information,  or requires  United  States  government  security
clearance for USDT's facilities or personnel. The Disclosure Schedule contains a
detailed  description of each Contract of the types referred to below,  to which
USDT is a party or by which it or its properties or assets is bound,  as to each
of which the following representations are made:

               2.18.1 Purchase Orders.  Unfilled  purchase orders or commitments
(i)  obligating  USDT to pay a total amount in excess of Five  Thousand  Dollars
($5,000),  or (ii)  regardless  of  amount,  that are not to be fully  performed
within one (1) year  after the date of this  Agreement.  None of those  purchase
orders or commitments materially exceeds USDT's normal requirements, or requires
a payment  materially  in excess of market price  (current at the time the order
was  placed  or the  commitment  was  made)  for the  goods  or  services  being
purchased.

               2.18.2  Sales  or  Service  Agreements.  Unfilled  agreements  or
commitments obligating USDT to provide products or services (i) under which USDT
will receive a gross payment in excess of Five  Thousand  Dollars  ($5,000),  or
(ii)  regardless of amount,  that are not to be fully  performed  within one (1)
year after the date of this Agreement.

               2.18.3 Leases.  Leases of real  property,  and leases of personal
property not  cancellable  without penalty on notice of sixty (60) days or less,
and  calling for  payment of an annual  gross  rental  exceeding  Five  Thousand
Dollars ($5,000).

               2.18.4 Loan  Agreements;  Security  Agreements.  Loan agreements,
indentures, mortgages, pledges, hypothecations, deeds of trust, conditional sale
or  title  retention  agreements,   security  agreements,   equipment  financing
obligations or guaranties, agreements of guarantee or indemnification or letters
of intent or commitment letters with respect to same.

               2.18.5  Distribution  Agreements.  Distribution,  sales agency or
franchise or similar  agreements,  or agreements  providing  for an  independent
contractor's services, or letters of intent with respect to same.

               2.18.6  Joint   Venture   Agreements.   Partnership   agreements,
shareholder  agreements or joint  venture  agreements of any kind, or letters of
intent with respect to same.

               2.18.7   Employment   and   Consulting   Agreements.   Employment
agreements,    consulting    agreements,    confidentiality    agreements    and
non-competition agreements.

               2.18.8 Intellectual Property Agreements. Licenses, assignments or
transfers of trademarks,  trade names, service marks, patents, copyrights, trade
secrets  or know  how,  or other  agreements  regarding  proprietary  rights  or
intellectual property.

               2.18.9  Construction   Agreements.   Land  purchase   agreements,
building or construction  agreements,  or other agreements relating to additions
or improvements to Real Property or any leased property of USDT.

               2.18.10 Non-Competition Agreements. Any agreements,  contracts or
commitments  containing any covenant limiting the right of USDT to engage in any
line of business or to compete with any person or entity.

               2.18.11 Other Agreements. Other material contracts, agreements or
understandings,  irrespective  of subject  matter and whether or not in writing,
not entered into in the ordinary course of business and not otherwise  disclosed
on the Disclosure Schedule.

               2.19 Bank and  Brokerage  Accounts  and Safe Deposit  Boxes.  The
Disclosure  Schedule  lists  the  title and  number  of each  bank  account  and
securities brokerage account of USDT, the bank or broker, and office location at
or with which the account is maintained, and the names of the persons authorized
to draw  against  the  account  or  otherwise  have  access to it or direct  its
disposition. The Disclosure Schedule also contains the same information for each
(i) safe deposit box leased by USDT,  and (ii) credit  institution at which USDT
has established a corporate credit card or similar account.

          2.20  Labor  and  Employment  Matters.  Except  as  set  forth  on the
Disclosure  Schedule,  USDT  (i) is not a  party  to any  collective  bargaining
agreement or  discussions or  negotiations  with any individual or group looking
toward any such agreement, and (ii) has not experienced any strike, grievance or
unfair labor practice claim, suit or administrative proceeding, and (iii) has no
reason to  believe  that any  employee  or  employee  group  has  filed  seeking
recognition as a collective  bargaining  representative or unit, and USDT has no
reason  to  believe  that  any  former  employer  of  any of  its  employees  is
contemplating remedial action of any nature against that employee or USDT, based
on the employee  having  terminated  the former  employment and having become an
employee of USDT, or based on the employee  having  misappropriated  proprietary
information  or  intellectual  property of the former  employer.  The Disclosure
Schedule contains detailed information about each contract, agreement or plan of
the following nature, whether formal or informal, and whether or not in writing,
to which USDT is a party or under which USDT has an  obligation:  (i) employment
agreements,  (ii) noncompetition agreements,  (iii) consulting agreements,  (iv)
pension and  profit-sharing  plans, (v) bonus plans,  (vi) stock purchase plans,
(vii) hospitalization, disability and other insurance plans, (viii) severance or
termination pay plans and policies, and (ix) other employee benefit,  welfare or
fringe benefit  plans,  whether or not described in Section 3(3) of the Employee
Retirement Income Security Act of 1974, as amended  ("ERISA").  Each plan of the
nature referred to above has been administered in accordance with its terms, all
presently  anticipated  payments thereunder have been properly accrued, and USDT
has never terminated or withdrawn from a plan of that nature under circumstances
resulting  (or that might result) in liability to the Pension  Benefit  Guaranty
Corporation  ("PBGC"),  the fund by which such plan is funded,  or the employees
(or beneficiaries)  for whose benefit the plan is maintained.  USDT has complied
in all material  respects with  Applicable  Laws relating to  employment,  civil
rights and equal employment  opportunities.  USDT has no obligation or liability
to pay medical or death benefits with respect to any employee or former employee
after such employee's termination of employment.

          2.21 Termination of Business Relationships. No supplier or licensor of
USDT,  and no Person  presently a customer or licensee of USDT, has evidenced to
USDT any intention to cancel or otherwise  terminate  its business  relationship
with USDT. Except as set forth on the Disclosure Schedule, no employee (with the
exception of clerical  employees),  agent or independent  contractor of USDT has
notified  USDT of its intent or desire to  terminate  that  employment  or other
relationship.

          2.22 Condition of Buildings and Personal Property. Except as set forth
on the  Disclosure  Schedule,  all of the  buildings,  fixtures,  machinery  and
material  equipment  owned or used by USDT is in good  operating  condition  and
repair,  and is of a quality  usable in the  ordinary  course of  business.  The
Disclosure Schedule contains specific information about each building,  and each
item of personal  property that has an initial  cost, or current book value,  in
excess of Five Thousand Dollars  ($5,000),  and each building and each such item
of personal property is covered by one of the insurance  policies referred to in
section 2.23 hereof.

          2.23 Insurance.  USDT is covered by valid, outstanding and enforceable
policies of insurance  issued by  reputable  insurers  covering its  properties,
assets and business  against  risks of the nature  normally  insured  against by
corporations  in the same or  similar  lines of  business  in  coverage  amounts
normally  carried by such  Persons  and in any event  sufficient  to avoid being
liable as co- insurer under the terms of such  policies,  each such policy being
described on the Disclosure  Schedule.  The Disclosure  Schedule also contains a
detailed  description of any pending insurance policy claim that relates to loss
or damage to the assets or business of USDT.  USDT has not failed to give,  in a
timely manner,  any notice  required under any such policies to preserve  USDT's
rights thereunder.

          2.24  Compliance with Laws.

               2.24.1  Laws.  USDT  and  its  officers,  directors,  agents  and
employees,  have  complied in all material  respects  with all  Applicable  Laws
relating to the business  conducted by USDT or to the properties owned or leased
and used by USDT.  USDT is not in default under any order,  writ,  injunction or
decree of any governmental authority or agency, or of any court or commission or
other  administrative  agency in any proceeding to which USDT is a party and has
not received  notice of any claims,  violation of, or failure to comply with any
law, rule, regulation,  ordinance,  judgment,  arbitration,  award or order, and
insofar as Seller and USDT are aware,  no such claim has been  threatened  or is
anticipated, nor is any investigation in respect thereof contemplated.

               2.24.2  Permits.  The  Disclosure  Schedule  lists  all  material
permits, licenses, registrations,  filings, authorizations,  consents, approvals
or other indicia of authority  necessary for the conduct of USDT's  business and
its  operations  on  the  Real  Property,   including  the  operation,  use  and
maintenance of any fixture, equipment,  machinery,  vessel, tank or installation
used in or  relating  to its  business  or  located on the Real  Property  or to
handle, transport,  dispose or transfer,  discharge, market or sell any goods or
any substance used, handled,  produced,  stored, disposed of, discharged or sold
in its business  ("Permits").  USDT has all material  Permits  necessary for the
conduct of its business and operation of its  facilities as presently  conducted
or  operated,  all  Permits  are in full  force  and  effect,  and  there  is no
condition,  nor has any event occurred which constitutes,  or with the giving of
notice or passage  of time would  constitute,  a  violation  of the terms of any
Permit.  All  applications for renewal of the Permits have been timely filed and
there is no required  modification  of any Permit or application  for renewal of
any Permit.

          2.25  Absence  of  Questionable  Payments.  None of USDT or any of its
officers,  directors,  agents or employees purporting to act on their behalf has
made or agreed to make any  payment  or other use of USDT's  assets (i) to or on
behalf of an official of any government, or for any purpose related to political
activity,  except as permitted by Applicable  Laws, (ii) for any of the purposes
described in Code section  162(c) or (iii) for  establishment  or maintenance of
any concealed fund or concealed bank account.

          2.26 All Business Conducted by USDT. Except as set forth and described
on the  Disclosure  Schedule,  the business and operations of USDT are conducted
exclusively  by  USDT,  and not by any  other  business  entity  whether  or not
affiliated with USDT.

          2.27  Environmental Protection and Occupational Safety.

               2.27.1  Compliance.   Except  as  set  forth  on  the  Disclosure
Schedule, there is no claim, suit, action, judgment or proceeding (contingent or
otherwise)  pending  against or involving USDT on account of any hazardous waste
(as that term is defined in 42 U.S.C.  section  6903(5)) or toxic  substance  or
based on any violation of any applicable  federal,  state or local  occupational
health or safety law, environmental  protection law, or hazardous waste or toxic
substance management, handling or disposal law, including but not limited to (i)
any  claim  for  damages  or  clean-up  or (ii) a  liability  in the form of any
restrictions,  specifications  or  requirements  pertaining to (A) products that
USDT manufactures, processes or sells or pertaining to the services it performs,
or (B) the use,  maintenance  or operation  of the real and personal  properties
owned or  occupied  by USDT.  There  exists no basis for any such  claim,  suit,
action,  judgment or proceeding.  All material  filings required to be made with
any Regulatory  Authority with respect to laws relating to the protection of the
environment, occupational health or safety or hazardous waste or toxic substance
management, handling or disposal have been timely made.

               2.27.2 Disposal.  Except as set forth on the Disclosure Schedule,
there  has not  been (i) any  material  release  or  threatened  release  of any
hazardous  waste or toxic  substance  from or on (A) any of the Real Property or
(B) any site, whether or not located on any of the Real Property, at which there
has been any  disposal  of any  hazardous  waste or solid waste (as that term is
defined in 42 U.S.C. section 6903(27)) for which USDT is or may be (contingently
or  otherwise)  liable,  or (ii) any  enforcement  order or notice of  violation
issued by any Regulatory Authority to USDT or the owners,  operators or users of
any  facilities  in which  order or notice  USDT is named with  reference  to an
alleged USDT act or omission.  USDT and its  predecessors  in interest have not,
directly or indirectly, disposed of hazardous or solid wastes except through the
contractors and at the facilities set forth on the Disclosure Schedule.

          2.28  Intellectual  Property.  Except as set  forth on the  Disclosure
Schedule,  USDT has full legal right,  title and interest in and to all patents,
patent  applications,   trademarks,  service  marks,  trade  names,  copyrights,
know-how,  trade secrets and other  material  intellectual  property,  including
without limitation confidential information, invented, developed or in which any
interest was held at any time by USDT or used in the conduct of USDT's  business
("Intellectual Property"). The conduct of USDT's business as presently conducted
and the unrestricted use and exploitation of the Intellectual  Property does not
infringe or misappropriate any rights held or asserted by any Person.  Except as
set forth on the Disclosure Schedule, no payments are required for the continued
use of the Intellectual  Property.  None of the Intellectual Property is or ever
has been declared  invalid or  unenforceable,  or is the subject of a pending or
threatened  action for  opposition,  cancellation,  declaration  of  invalidity,
unenforceability or misappropriation or like claim, action or proceeding. USDT's
trade  secrets  and  proprietary  information  are,  and have at all times been,
maintained on a "need-to-know"  basis, and, in all material respects,  disclosed
to third  parties only  pursuant to  confidentiality  agreements  sufficient  to
ensure their  protection  under applicable trade secret law. Except as set forth
on the Disclosure  Schedule,  persons who are, or were,  employees,  officers or
agents of USDT have signed  confidentiality  agreements  with USDT sufficient to
maintain the confidentiality of trade secrets or other proprietary  information.
The Disclosure  Schedule  contains  detailed  information about the Intellectual
Property as indicated below:

               2.28.1 A list identifying with particularity (but as far as trade
secrets and proprietary  information are concerned,  not such  particularity  as
will amount to disclosure of the same) all patents,  trademarks,  service marks,
trade names, copyrights,  know how, trade secrets and other material proprietary
information developed by USDT or used in its business,  giving the proprietor of
each and a description of the contractual or other rights of USDT in the same;

               2.28.2 A list of pending  applications by USDT for patents or for
registration of any trademark,  service mark, trade name or copyright  developed
by USDT or used in USDT's business;

               2.28.3 A list of all grants of rights in any of the  foregoing to
any Person from USDT.

          2.29 Regulatory Filings.  USDT has made all of the filings required to
be made with all  Regulatory  Authorities  with  respect  to its  properties  or
business on a timely basis.  None of such filings contains any misstatement of a
material  fact, or omits to state a material fact necessary in order to make any
such filing not misleading.

          2.30  Disclosure.  All copies of  documents  supplied to Buyer and its
agents and counsel by Sellers or USDT in connection  with the  investigation  of
USDT,  are true,  correct and complete  copies of the documents  they purport to
represent. No representation or warranty of Sellers or USDT in this Agreement or
in any other document, certificate,  exhibit, statement or schedule furnished or
to be  furnished  to  Buyer  under  this  Agreement  or in  connection  with the
transactions  contemplated thereby contains or will contain any untrue statement
of a material  fact, or omits or will omit to state a material fact necessary to
make the factual  statements  contained  therein,  in light of the circumstances
under  which they were  made,  not  misleading.  Disclosures  on the  Disclosure
Schedule  shall refer to the  applicable  section  numbers of this Agreement and
shall be appropriately  cross- referenced to indicate any matter  constituting a
disclosure under more than one section of this Agreement.

          2.31 Broker or Finders Fees.  Neither  Sellers nor USDT has negotiated
or  contracted  with,  or  obligated  itself to,  any  Person for a broker's  or
finder's fee in connection  with any of the  transactions  contemplated  by this
Agreement.  Sellers will jointly and severally indemnify and hold harmless Buyer
and its  Affiliates  (including  USDT) from and against any claim of any broker,
agent,  finder  or other  person  for a  commission  or fee based  upon  alleged
dealings with Seller or USDT with respect to this Agreement or the  transactions
contemplated  hereby. An "Affiliate" of, or person or entity  "Affiliated" with,
another  person or entity,  shall mean any person or entity  that  directly,  or
indirectly through one or more intermediaries, controls, is controlled by, or is
under common control with, such person or entity.

          2.32  Powers  of  Attorney.  No  power  of  attorney  given by USDT is
currently outstanding.

                                    ARTICLE 3
             Representations and Warranties of Buyer

          Buyer represents and warrants to Seller as follows:

          3.1  Organization  and  Qualification.  Buyer  is a  corporation  duly
organized, validly existing and in good standing under the laws of Delaware.

          3.2  Authorization;  Valid  and  Binding  Obligation.  Buyer  has full
corporate  power and  authority  to execute and deliver  this  Agreement  and to
perform its  obligations  hereunder.  All corporate  action required in order to
authorize  such  execution,  delivery  and  performance  has  been  taken.  This
Agreement  constitutes  the valid and binding  obligation of Buyer,  enforceable
against  it in  accordance  with  its  terms,  assuming  the due  authorization,
execution and delivery hereof by the other parties hereto.

          3.2A  Capitalization.  Avitar has an authorized  capital of 80,000,000
shares of stock,  of which  75,000,000  shares are common  stock,  and 5,000,000
shares are preferred stock, of which 21,416,656 shares of common stock,  157,300
shares of Series A preferred  stock and  1,694,137  shares of Series B preferred
stock are  outstanding.  Each share of Series A preferred  stock is  convertible
into three shares of common stock and each share of Series B preferred  stock is
convertible  into 10 shares of common stock.  No shares are held in the treasury
of  Avitar.  All  issued  and  outstanding  shares of Avitar  are fully paid and
non-assessable and have not been issued in violation of any pre-emptive or other
rights of any person. No other class of capital stock of Avitar is authorized or
outstanding. There are neither outstanding nor authorized any options, warrants,
rights, calls, commitments,  convertible securities, subscription rights, rights
of exchange, or other rights, plans or other agreements of any nature which will
or may result in the future in Avitar  being or becoming  obligated to purchase,
issue or sell  additional  shares of capital stock to any  individual or entity,
except  there are  10,826,000  shares of common stock  reserved for  outstanding
warrants and options  exercisable within 60 days. There are no voting agreements
or voting trusts respecting shares of Avitar's capital stock.

          3.3 No  Violation.  The  execution  and delivery of this  Agreement by
Buyer, and consummation by it of the transactions contemplated thereby, will not
(i) conflict with or breach the certificate of incorporation or By-laws of Buyer
or any  Contracts  to which Buyer is a party or by which it is bound or to which
it or its assets are  subject,  (ii) cause or amount to any default or violation
of any such Contracts,  or (iii)  accelerate or permit any Person to accelerate,
terminate, modify or cancel any rights under any such Contracts. Such execution,
delivery and consummation will not violate, breach or constitute a default under
any Applicable Law to which Buyer (or its assets) is subject.

          3.4  Consents and  Approvals.  No consent or approval of any Person or
Regulatory  Authority,  and no  approval,  order,  license,  permit,  franchise,
declaration  or filing of any nature is required as a result of or in connection
with Buyer's  execution,  delivery or performance of its obligations  under this
Agreement.

          3.5  Litigation.  Omitted.

          3.6  Disclosure.  No  representation  or  warranty  of  Buyer  in this
Agreement or in any other document, financial statement,  certificate,  exhibit,
statement or schedule  furnished or to be furnished to the other parties  hereto
under this Agreement or in connection with the transactions  contemplated hereby
contains or will contain any untrue  statement of a material  fact,  or omits or
will omit to state a material  fact  necessary  to make the  factual  statements
contained therein,  in light of the circumstances under which they are made, not
misleading.

          3.7 Investment Representation. Buyer acknowledges that the Shares will
not be  registered  under the 1933 Act or any  state  securities  law.  Buyer is
acquiring all the Shares for investment and not with a view to distribution. Any
certificates representing the Shares may be endorsed with appropriate legends to
reflect federal and state securities law restrictions on transfers.

          3.8 Broker.  Buyer has not negotiated or contracted with, or obligated
itself to, any person for a broker's or finder's fee in  connection  with any of
the transactions  contemplated by this Agreement.  Buyer will indemnify and hold
harmless  Sellers  from and against any claim of any  broker,  agent,  finder or
other  person for a claim of any  broker,  agent,  finder or other  person for a
commission  or fee based upon alleged  dealings  with Buyer with respect to this
Agreement or the transactions contemplated hereby.

          3.9 Title to Avitar Shares.  On the Closing Date, the Avitar Shares to
be transferred  to Seller are  authorized  and they have been  authorized by the
Board of  Directors to be issued to the  Sellers.  At the  Closing,  Seller will
acquire good,  valid and marketable title to and beneficial and record ownership
of the  Avitar  Shares to be  transferred  to the  Seller  free and clear of all
liens, restrictions, proxies, voting trusts, voting agreements, encumbrances and
claims of any kind,  other  than as  provided  in  Sections  1.2 and 1.3 of this
Agreement.

          3.10 Absence of Undisclosed Liabilities.  Avitar has no liabilities of
any nature,  whether  absolute,  contingent or otherwise,  and whether due or to
become due, which are material,  singularly or in the aggregate,  to its assets,
business,  operations,  prospects  or  financial  condition,  except  (i)  those
disclosed or reserved against in the financial  statements or reports filed with
the  Securities  and Exchange  Commission and (ii) those arising in the ordinary
course of business after the date of the financial statements.

          3.11 No  Adverse  Changes.  Except  for  events  contemplated  by this
Agreement,  since December 31, 1998,  there have been no material adverse change
in the condition  (financial or  otherwise),  properties,  assets,  liabilities,
rights, obligations,  operations,  business, shareholders equity or financial or
prospects of Avitar and no such matters or events are contemplated.

          3.12  Litigation.  Except as set forth in its financial  statements or
reports filed with the Securities and Exchange Commission, there are no actions,
suits,  proceedings or investigations pending or threatened against or affecting
Avitar,  at law or in equity,  or by or before any  governmental  or  regulatory
agency or department.

          3.13 Compliance with Laws. Avitar and its officers,  directors, agents
and  employees,  have  complied  in all  material  respects  with  all  laws and
ordinances  relating  to the  business  conducted  by Avitar and all  securities
issued by Avitar.  Avitar is not in default under any order, writ, injunction or
decree of any governmental authority or agency, or of any court or commission or
other administrative agency in any proceeding to which Avitar is a party and has
not received  notice of any claims,  violation of, or failure to comply with any
law, rule, regulation,  ordinance,  judgment,  arbitration,  award or order, and
insofar as Avitar is aware, no such claim has been threatened or is anticipated,
nor is any investigation in respect thereof contemplated.

          3.14 Absence of  Questionable  Payments.  None of Avitar or any of its
officers,  directors,  agents or employees purporting to act on their behalf has
made or agreed to make any payment or other use of Avitar's  assets (i) to or on
behalf of an official of any government, or for any purpose related to political
activity,  except as permitted by law, (ii) for any of the purposes described in
Code section 162(c) or (iii) for  establishment  or maintenance of any concealed
fund or concealed bank account.


                                    ARTICLE 4
                           Covenants and Undertakings

          Sellers and USDT,  jointly and severally,  covenant to Buyer and agree
to comply,  or to cause  compliance,  with the  provisions of this Article 8, as
applicable,  except  as  compliance  may be waived in  writing  in a  particular
instance by Buyer:

          4.1  Non-Competition; Confidentiality.

               4.1.1 Non-Competition by Sellers. Absent prior written consent by
Buyer, for a period of five years from the Closing Date,  neither Seller nor any
child or child-in-law,  shall directly or indirectly be engaged in or affiliated
(including as principal,  agent, investor,  guarantor or lender) with any Person
engaged in the drug testing business.  Notwithstanding the foregoing, nothing in
this subsection  4.1.1 shall restrict  Sellers,  or any child or child-in-law of
Sellers from holding,  solely for investment  purposes,  stock in  publicly-held
companies,  not exceeding five percent (5%) of the issued and outstanding  stock
of any one company.  Sellers  acknowledge  that breach of this subsection  would
entail an  irreparable  injury to Buyer and USDT and that,  in  addition  to the
other remedies available to Buyer, Buyer or USDT shall be entitled to injunctive
and other equitable relief to prevent any actual, intended or likely breach.

               4.1.2 Confidentiality. In furtherance of the acquisition by Buyer
of USDT  from  and  after  the  date  of  this  Agreement  (and  subject  to the
consummation of the Closing),  each Seller covenants and agrees that,  except as
compliance  may be waived in  writing in a  particular  instance  by Buyer,  all
Confidential  Information  in the  possession  of either Seller shall be held in
strict  confidence and shall never be used (except as, and limited to the extent
that,  may be required  for tax  reporting  or under other  Applicable  Laws) or
disclose any  Confidential  Information to others without  Buyer's prior written
consent unless the  information in question (i) is, or becomes,  generally known
in the drug  testing  industry  in the  combination  and form  known to USDT and
without fault of Seller or (ii) is  rightfully  obtained from a third party with
no  restriction  on  disclosure.   "Confidential  Information"  shall  mean  all
proprietary  information  relating to USDT's business not generally known in the
drug  testing  industry  in the  combination  and form known to USDT  including,
without  limitation,  know-how,  lines of research  and  development  previously
undertaken, in process or planned and the results thereof, identities of sources
of supply,  identities of customers,  special customer needs, operating and cost
data, sales and pricing data, and marketing, financial and other business plans.

               4.1.3  No  Enticement;  No  Raiding.  None of  Sellers  or  their
Affiliates shall entice, induce or encourage any unaffiliated third party or any
of its employees or agents to engage in any activity which, if engaged in by the
party to this Agreement in question, would violate the provisions of section 4.2
hereof.

               4.1.4 Termination for "Good Reason".  The foregoing provisions of
Section 4.1 shall not be  enforceable  by Buyer in the event that Douglas  Lewis
(the "Executive" for the purposes of this subsection  4.1.4) shall terminate his
employment with USDT (the "Employer" for the purposes of this subsection  4.1.4)
for "Good  Reason"  in  accordance  with the terms of the  Employment  Agreement
between  Executive and Employer  referred to in Section 5.11 hereof. As provided
in the  Employment  Agreement,  resignation  by the  Executive for "Good Reason"
shall mean a resignation  by the Executive in the event that the Employer  shall
be in material breach of its obligations  under this Agreement or the Employment
Agreement  (subject to any right of setoff in respect of such obligations  under
this Agreement) and such material breach  continues for thirty (30) or more days
after the Executive gives written notice of such material breach to the Board of
Directors of Employer.

          4.2  Conduct  of  Business  Prior  to  Closing.  From the date of this
Agreement  to  the  Closing  Date,  USDT  shall  preserve  intact  the  business
organization  of USDT and each Seller and USDT shall use their  respective  best
efforts to retain the services of USDT's present officers,  employees and agents
and keep them available to Buyer,  and preserve  USDT's  relationships  with its
customers, distributors, suppliers and others, all so as to retain the good will
of  USDT.  USDT  shall  carry  on  its  business  in  the  ordinary  course  and
substantially the same manner as conducted on the date of this Agreement, except
as may be  approved  by Buyer in writing or as  contemplated  by this  Agreement
(which shall  include the use of Sellers' best efforts to obtain any consents or
approvals necessary for the consummation of this Agreement).

          4.3 No Other  Business  Combination.  From and  after the date of this
Agreement,  none of Sellers or USDT shall take any action  looking  toward  USDT
becoming a party or subject to any business  combination  transaction (such as a
merger, consolidation or sale of assets) or agreement of sale, option, pledge or
other  disposition or  encumbrance of the assets of its business,  other than as
contemplated by this Agreement.

          4.4  Filings   and   Authorizations.   Each  party,   as  promptly  as
practicable,  shall take,  or cause to be taken,  all other  actions  necessary,
proper or advisable in order for it to fulfill its obligations  hereunder.  Each
of the parties shall  coordinate  and  cooperate  with one another in exchanging
such  information and supplying such reasonable  assistance as may be reasonably
requested by each in connection with the foregoing.

          4.5 Public  Announcements.  Each party shall  consult  with each other
before  issuing any press  release or otherwise  making any public  statement or
disclosure  to any Person  (other than those of their  officers,  employees  and
agents who have a need to know for purposes of this  Agreement)  with respect to
this Agreement and the state of the transactions  contemplated  hereby and shall
not issue any such press release or make any such public statement or disclosure
without prior approval  thereof by the other party,  which approval shall not be
unreasonably  withheld or delayed.  Nothing in this section  shall  prevent such
public   disclosure  with  respect  to  this  Agreement  and  the   transactions
contemplated  hereby  as a party  may be  required  to make by  applicable  law,
provided it shall have attempted,  to the extent reasonably  possible,  to clear
such disclosure with the other party.

                                    ARTICLE 5
           Conditions Precedent to Buyer's Obligations

          The  obligation  of Buyer to acquire  the  Shares  and to deliver  the
Consideration  at the  Closing is subject to the  fulfillment  of the  following
conditions  (except to the extent  waived in writing by Buyer) and Sellers shall
use their best efforts to cause each such condition to be so fulfilled:

          5.1 Accuracy of Representations  and Warranties.  All  representations
and warranties of Sellers and USDT contained  herein shall be true,  correct and
complete in all material respects when made and as of the Closing Date.

          5.2 Obligations Performed.  All covenants,  agreements and obligations
required by the terms of this  Agreement  to be performed by Sellers and USDT at
or before the Closing shall have been performed in all material respects.

          5.3  Consents.  All consents,  waivers,  permits,  authorizations  and
government or regulatory  approvals required to be obtained prior to the Closing
shall have been received.

          5.4  Government  Approvals.   Any  prescribed  waiting  periods  under
Applicable Laws with respect to the transactions contemplated by this Agreement,
shall  have  expired;  and  there  shall be no  pending  governmental  action or
proceeding  to,  and  no  injunction  which  does,   restrain  or  prohibit  the
transactions contemplated by this Agreement.

          5.5 Compliance with Laws. Buyer shall be reasonably satisfied that the
Closing shall be in compliance with all Applicable Laws.

          5.6 Litigation. No action or proceeding shall be pending or threatened
before any court or  Regulatory  Authority  which in the  reasonable  opinion of
Buyer and its counsel may result in the  restraint,  prohibition or obtaining of
substantial  damages or other relief in  connection  with this  Agreement or the
consummation of the transactions contemplated by it.

          5.7 Material  Adverse  Change.  No material  adverse change shall have
occurred in the assets, operations, prospects or financial condition of USDT.

          5.8 Other Matters. All legal and other proceedings,  and all documents
or instruments required in connection with the transactions contemplated by this
Agreement  shall be reasonably  satisfactory  in form and substance to Buyer and
its legal counsel.

          5.9 Officers and  Directors.  If Buyer shall have  specified,  Sellers
shall have caused such specified officers and directors of USDT to resign.

          5.10 Escrow  Agreement.  Buyer shall have received an escrow agreement
duly  executed  by Sellers,  in the form  attached  hereto as Exhibit  5.10 (the
"Escrow Agreement") and such Escrow Agreement shall be in full force and effect.

          5.11 Employment  Agreements.  Buyer shall have received the Employment
Agreements  duly executed by (a) Douglas Lewis and (b) Christine  Moore, in each
case in form satisfactory to Buyer.

                                    ARTICLE 6
           Conditions Precedent to Sellers' Obligations

          The  obligation  of Sellers to sell the USDT  Shares at the Closing is
subject to the  fulfillment  of the following  conditions  (except to the extent
waived in writing by Sellers) and Buyer shall use its best efforts to cause each
such condition to be so fulfilled:

          6.1 Accuracy of Representations  and Warranties.  All  representations
and warranties of Buyer contained herein shall be true,  correct and complete in
all material respects when made and as of the Closing Date.

          6.2 Obligations Performed.  All covenants,  agreements and obligations
required by the terms of this  Agreement  to be  performed by Buyer at or before
the Closing shall have been performed in all material aspects.

          6.3  Consents.  All consents,  waivers,  permits,  authorizations  and
government or regulatory  approvals required to be obtained prior to the Closing
or listed shall have been received.

          6.4  Compliance  with  Laws.  Sellers  and USDT  shall  be  reasonably
satisfied that the Closing shall be in compliance with Applicable Laws.

          6.5 Litigation. No action or proceeding shall be pending or threatened
before any court or  Regulatory  Authority  which in the  reasonable  opinion of
Sellers and their counsel may result in the restraint,  prohibition or obtaining
of substantial  damages or other relief in connection with this Agreement or the
consummation of the transactions contemplated by it or which would be reasonably
likely to impair the value of the Avitar Shares to be delivered to Sellers.

          6.6 Escrow Agreement.  Sellers shall have received an escrow agreement
duly executed by Buyer,  in the form attached hereto as Exhibit 6.6 (the "Escrow
Fund  Agreement")  and such  Escrow  Fund  Agreement  shall be in full force and
effect.

          6.7 Material  Adverse  Change.  No material  adverse change shall have
occurred in the assets, operations, prospects or financial condition of Avitar.

          6.8 Other Matters. All legal and other proceedings,  and all documents
or instruments required in connection with the transactions contemplated by this
Agreement shall be reasonably  satisfactory in form and substance to Sellers and
USDT and their legal counsel.

                                    ARTICLE 7
                                Other Agreements

          7.1 General Indemnification.  (a) Sellers hereby jointly and severally
indemnify  and hold  and  save  Buyer  and  USDT  and its  officers,  directors,
employees and agents (the "Indemnified  Parties")  harmless from and against any
and all liability,  loss, cost, damages, expenses (including attorney's fees and
expenses and court costs) or deficiency or obligation of, or claim against, USDT
or Buyer of every kind, nature and description, absolute or contingent:

                    (i)  accrued in respect  of, or  measured  by, or  otherwise
arising from the income, operations,  franchises,  properties or assets of USDT,
for any period or periods  ending on or prior to the Closing Date or existing or
outstanding  against USDT prior to the Closing Date,  or thereafter  coming into
being or arising by reason of any state of facts  existing  prior to the Closing
Date  including,  without  limitation,  claims  relating to Taxes,  assessments,
deficiencies,  penalties  and  interest,  except (A) to the extent that the same
have  been  provided  for,  reflected  or  reserved  against  in  the  Financial
Statements,  (B) to the extent disclosed in the Disclosure Schedule,  and/or (C)
to the extent of contractual  obligations incurred in the ordinary course of the
business of USDT since the date of the May 31, 1999 Financial Statements;

                    (ii)  resulting  from or relating to any  misrepresentation,
omission, breach of warranty,  covenant or representation by either of Seller or
USDT in connection with the transactions contemplated hereby; and

                    (iii)  all   actions,   suits,   proceedings,   assessments,
judgments,  costs and expenses (including reasonable legal fees) incident to the
foregoing  and  including  such  legal  fees,  expenses  and costs  incurred  in
enforcing this indemnity.

               (b) In the event that any legal proceeding shall be instituted or
any claim or demand  shall be made against any  Indemnified  Party in respect of
which such Indemnified Party shall have the right to  indemnification or payment
from the Sellers  under this  Section  7.1,  the party  seeking  such payment or
indemnification  will  promptly  cause  written  notice  thereof  to be given to
Sellers, provided that failure to give such notice shall not relieve the Sellers
of their  indemnification  obligations,  except where,  and solely to the extent
that, the failure to notify actually and materially prejudices the rights of the
Sellers.  Sellers shall be entitled to participate,  at Sellers' own expense and
by employing  counsel selected by them subject to approval by Buyer, in any such
legal  proceeding or the negotiation and settlement of any such claim or demand;
provided,  however,  that such participation  shall not relieve Sellers from the
obligation to reimburse the Indemnified  Parties for their reasonable legal fees
and expenses incurred by them in defending against any such proceeding, claim or
demand.  Sellers and Buyer mutually  agree to cooperate  fully in the conduct of
any such legal proceeding,  negotiation or settlement, and any Indemnified Party
will not compromise or settle any such  proceeding,  claim or demand without the
prior written  consent or approval of Sellers,  such written consent or approval
not to be unreasonably  withheld by Sellers.  Any Indemnified Party shall not in
the defense of any such claim,  except  with the prior  written  consent of each
Seller  affected,  consent to entry of any judgment or enter into any settlement
which does not include as an  unconditional  term the release by the claimant or
plaintiff of the Indemnified Party from all further liability in respect of such
claim. In the event that any such legal proceeding,  claim or demand shall arise
out of a transaction or transactions covering or relating to, or arising during,
any period or periods  wherein  Sellers on the one hand,  and Buyer on the other
hand,  shall each be  responsible  for a portion of such liability or obligation
arising therefrom under the terms hereof, then the parties shall, each selecting
its own counsel and  bearing  its own expense for their  respective  portions of
such  liability  or  obligations,  defend  against or  respond  to such  action,
proceeding, claim or demand, and no settlement or compromise may be made without
the joint consent or approval of all such parties,  such consent or approval not
be unreasonably withheld by Sellers.

               (c) After any  final  judgment  or final  award  shall  have been
rendered  by  a  court,  arbitration  board,  or  administrative  agency,  or  a
settlement  shall have been agreed  upon,  with respect to or by reason of which
any Indemnified Party shall be entitled to be indemnified hereunder, or any item
of cost or expense has been incurred with respect to which an Indemnified  Party
is  entitled  to be  indemnified  hereunder,  then the  Indemnified  Party shall
forward  to  Sellers  notice of any sums due and  owing by  Sellers  under  this
paragraph  with respect to such matter,  whereupon,  all of the sums so owing by
Sellers shall be paid by or on behalf of Sellers to  Indemnified  Parties within
thirty (30) days after the date of such notice.

               (d) In the event that Buyer receives  indemnification from Seller
pursuant to this Section 7.1,  such event shall not be deemed to  constitute  an
election  by Buyer to  rescind  this  Agreement  nor in any manner to affect the
title of Buyer to all of the Shares being acquired by Buyer hereunder.

               (e) The indemnification  provisions contained in this Section 7.1
shall be in addition to, and not in lieu of, any other rights or remedies  which
Buyer may have at law or in equity under this Agreement or otherwise.

               (f) Notwithstanding the foregoing  indemnification  provisions of
this  Section  7.1,  the  Seller  and Buyer  agree that no claims may be brought
against  Seller under this Section 71.  unless and until Buyer's claim or claims
against Seller  exceed,  in the  aggregate,  the sum of Fifty  Thousand  Dollars
($50,000.00).

               (g) The maximum liability of Sellers to Buyer under the foregoing
indemnification  provision  or this  Section  7.1 shall not exceed the  Escrowed
Shares deposited  pursuant to the Escrow Agreement dated as of June 30, 1999. In
no event shall  Douglas  Lewis or Veronica  Lewis  become  personally  liable to
Avitar,  Inc.  pursuant  to the  foregoing  indemnification  provisions  of this
Section 7.1. It is expressly  understood  and agreed that, as provided  above in
subsection 7.1 (e), the indemnification provisions contained in this Section 7.1
shall be in addition to, and not in lieu of, any other rights or remedies  which
Buyer may have at law or in equity under this Agreement or otherwise.

          7.2 Buyer's Indemnification for Seller's Contingent  Liabilities.  (a)
Buyer  hereby  indemnifies  and holds and saves each  Seller  (the  "Indemnified
Party" or, jointly, the "Indemnified Parties") harmless from and against any and
all liability,  loss, cost,  damages,  expenses  (including  attorney's fees and
expenses and court costs) or  deficiency  or  obligation  of, or claim  against,
Seller,  or either of them, of every kind,  nature and description  arising from
and after the Closing Date with respect to:

          (i) The equipment  finance agreement dated March 16, 1999 between USDT
and American  Express  Capital  Finance,  LLC.,  and the guaranty or  guaranties
thereof;

          (ii) The  promissory  note dated February 5, 1999 from USDT to LaSalle
Bank, N.A. in the original principal amount of $100,000.00,  and any guaranty or
guaranties thereof;

          (iii)  The  promissory  note  dated  September  26,  1997 from USDT to
LaSalle  Bank,  N.A. in the  original  principal  amount of  $25,000.00  and any
guaranty or guaranties thereof;

           (iv) The equipment  lease dated May 5, 1999 between USDT and Copeilco
and any guaranty or guaranties thereof, and

            (v) The lease of the real estate between institute of Gas Technology
and USDT dated December 1, 1996, for the office and laboratory space occupied by
USDT at 1700 S.  Mt.  Prospect,  Des  Plaines,  Illinois,  and any  guaranty  or
guaranties thereof.

               (b) In the event that any legal proceeding shall be instituted or
any claim or demand  shall be made against any  Indemnified  Party in respect to
which such Indemnified Party shall have the right to  indemnification or payment
from the Buyer  under  this  Section  7.2,  the party  seeking  such  payment or
indemnification will promptly cause written notice thereof to be given to Buyer,
provided  that  failure to give such  notice  shall not relieve the Buyer of its
indemnification obligations.  Buyer shall be entitled to participate, at Buyer's
own  expense  and by  employing  counsel  selected  by it,  in  any  such  legal
proceeding  or the  negotiation  and  settlement  of any such  claim or  demand;
provided,  however,  that such  participation  shall not relieve  Buyer from the
obligation to reimburse the Indemnified  Parties for their reasonable legal fees
and expenses incurred by them in defending against any such proceeding, claim or
demand.  Sellers and Buyer mutually  agree to cooperate  fully in the conduct of
any such legal proceeding,  negotiation or settlement, and any Indemnified Party
will not compromise or settle any such  proceeding,  claim or demand without the
prior written consent or approval of Buyer, such written consent or approval not
to be unreasonably  withheld by Buyer.  Any Indemnified  Party shall not, in the
defense  of any such  claim,  except  with the prior  written  consent of Buyer,
consent to entry of any  judgment  or enter into any  settlement  which does not
include as an unconditional term the release by the claimant or plaintiff of the
Indemnified Party from all further liability in respect to such claim.

               (c) After any  final  judgment  or final  award  shall  have been
rendered  by  a  court,  arbitration  board,  or  administrative  agency,  or  a
settlement  shall have been agreed  upon,  with respect to or by reason of which
any Indemnified Party shall be entitled to be indemnified hereunder, or any item
of cost or expense has been incurred with respect to which an Indemnified  Party
is  entitled  to be  indemnified  hereunder,  then the  Indemnified  Party shall
forward to Buyer notice of any sums due on and owing by Buyer to the Indemnified
Parties to be paid to the Indemnified  Parties within thirty (30) days after the
date of such notice.

               (d) The indemnification  provisions contained in this Section 7.2
shall be in addition to, and not in lieu of, any other rights or remedies  which
Sellers or Buyer may have at law or in equity under this Agreement or otherwise.

               (e) Buyer shall  deposit with the Escrow Agent  identified in the
separate Escrow Fund Agreement,  the sum of Two Hundred Seventy Thousand Dollars
($270,000.00)  at or prior to closing to  guaranty  Buyer's  indemnification  of
Sellers  pursuant to this Section 7.2. The Escrow Fund Agreement shall be in the
form attached hereto as Exhibit 6.6 .

                                    ARTICLE 8
                                     Closing

          8.1 Closing.  The Closing  ("Closing") of the sale and purchase of the
Shares shall take place at the office of Buyer  located at 65 Dan Road,  Canton,
Massachusetts  on July 9, 1999, at 10:00 a.m.  local time, or at such other time
and place as may be mutually  agreed upon by the  parties  hereto.  The date and
time  of  the  Closing  is  referred  to  herein  as  the  "Closing  Date".  All
transactions  at the Closing  shall be deemed to take place  simultaneously  and
none shall be deemed to have taken  place  unless and until all shall have taken
place.  Buyer,  on the one hand, and Sellers and USDT, on the other hand,  shall
have the right to waive any conditions of the Closing or receipt of documents at
the Closing.

          8.2 Deliveries by Sellers at the Closing. At the Closing,  Sellers and
USDT shall deliver, or cause to be delivered, as applicable, to Buyer:

               8.2.1 Shares.  Certificates  representing all of the Shares, free
and clear of all liens, encumbrances, pledges and claims of any kind accompanied
by duly executed stock powers or other  instruments of transfer  satisfactory to
Buyer and  sufficient  to transfer the Shares to Buyer,  together  with required
stock transfer tax stamps or cash in the appropriate amount in lieu thereof.

               8.2.2  Opinion of  Counsel.  The  opinion of Siebel,  Schofield &
Varde,  counsel to Sellers and USDT,  dated the Closing  Date and  addressed  to
Buyer.

               8.2.3 Other  Documents.  Such other  documents,  certificates and
instruments as are specified in this Agreement  (including,  without limitation,
the Escrow  Agreement and the Escrow Fund Agreement) or reasonably  requested by
Buyer to consummate this transaction.

          8.3  Deliveries by Buyer at the Closing.  At the Closing,  Buyer shall
deliver, or cause to be delivered, as applicable, to Sellers:

               8.3.1  Purchase Price.  The Avitar Shares as
provided in Section 1.

               8.3.2 Opinion of Counsel. The opinion of Dolgenos Newman & Cronin
LLP, counsel to Buyer, dated the Closing Date and addressed to Sellers.

               8.3.3 Other  Documents.  Such other  documents,  certificates and
instruments as are specified in this Agreement  (including,  without limitation,
the Escrow  Agreement and the Escrow Fund Agreement) or reasonably  requested by
Seller or USDT to consummate this transaction.

                                    ARTICLE 9
                           Survival of Representations

          9.1 Survival of  Representations,  Warranties and  Covenants.  (a) The
respective  representations,  warranties,  agreements  and covenants made by any
party in this Agreement  shall survive  execution and delivery of this Agreement
and the consummation of the transactions contemplated hereby for a period of two
(2) years after the Closing Date  notwithstanding  any  investigation,  audit or
review made at any time by any party to this Agreement and  notwithstanding  the
delivery of any documents,  exhibits, schedules or certificates pursuant to this
Agreement.  Each of the  representations,  warranties and covenants  relating to
Taxes,  and those  contained in Section 2.27  (Environmental  Protection)  shall
survive for six (6) years from the Closing Date.

               (b) In the  event of any  dispute  arising  hereunder,  any party
hereto may pursue, in addition to any rights specifically granted hereunder, any
and all legal rights available and may at any time seek such equitable  remedies
as are available or necessary to preserve the rights  granted  hereby,  it being
understood that remedies hereunder shall be deemed cumulative and nonexclusive.

          9.2  Arbitration of All Disputes.  The parties agree that in the event
of any  dispute  arising  out of or in  connection  with this  Agreement  or any
related agreements or contracts,  including any employment  agreements or escrow
agreements  referred to herein or attached as exhibits hereto, the parties agree
to submit all such disputes to binding  arbitration  before three arbitrators in
accordance  with the commercial  arbitration  rules of the American  Arbitration
Association.  Each party shall  designate one  arbitrator and the two designated
arbitrators shall,  jointly,  designate the third arbitrator.  The parties agree
that the  arbitration  may be  commenced  by either  party by means of a written
notice of  intention to arbitrate to the other party ninety (90) days in advance
of the commencement to the arbitration proceedings.  All such arbitrations shall
be  conducted  at Chicago,  Illinois.  Each party shall bear his, her or its own
costs, expenses and fees in any such arbitration.

                                   ARTICLE 10
                         Cooperation; Further Assurances

          10.1 Cooperation;  Further Assurances. Each party will at any time and
from time to time  execute,  acknowledge,  deliver and perform all such  further
acts,  deeds,  assignments,  transfers,  conveyances,  powers  of  attorney  and
assurances as may be necessary or  appropriate  to carry out the  provisions and
intent of this Agreement.

                                   ARTICLE 11
                                     Notices

          11.1  Notices.   Each  notice,   request,   waiver,  demand  or  other
communication  required or permitted  under this Agreement  shall be in writing,
and shall be deemed duly given (i) when delivered by hand or by courier  against
receipt  therefor or (ii) when five (5) days have elapsed after its  transmittal
by registered or certified mail, postage prepaid,  return receipt requested,  to
the  addresses  set forth below,  in each case with a copy  provided in the same
manner and at the same time to the Persons shown below.

          If to Buyer:

               Avitar Inc.
               65 Dan Road
               Canton, MA 02021

               Attn: Chief Financial Officer


          with a copy to:


               Dolgenos Newman & Cronin LLP
               96 Spring Street
               New York, NY 10012

               Attn: Eugene M. Cronin, Esq.


          If to Sellers:

               Douglas Lewis and Veronica Lewis
               53 Yorkshire Woods
               Oak Brook, Illinois 60521


          with a copy to:

               Siebel, Schofield & Varde
               Three First National Plaza
               70 West Madison, Suite 460
               Chicago, Illinois 60602
               Attn: Paul F. Schofield, Esq.

or to such different  addresses and Persons as to which a party has given notice
in the  manner  provided  in  this  Article  12.  Notwithstanding  the  previous
sentence, notices of change of address shall be effective only upon receipt.

                                   ARTICLE 12
                                  Miscellaneous

          12.1 Entire  Agreement.  This  Agreement,  including  the Exhibits and
Disclosure Schedule attached hereto and other documents delivered at the Closing
pursuant to this Agreement,  contains the entire understanding of the parties in
respect  of  its  subject  matter  and  supersedes  all  prior   agreements  and
understandings between or among the parties with respect to such subject matter.
The  Exhibits  and  Disclosure  Schedule  constitute a part hereof as though set
forth in full above.

          12.2  Expenses;  Taxes.  The  parties  shall  pay  their  own fees and
expenses,  including  their own counsel fees,  incurred in connection  with this
Agreement or any  transaction  contemplated  by this  Agreement.  Any sales tax,
stamp  duty,  transfer  or other tax  arising  out of the sale of the Shares and
consummation of the transactions contemplated by this Agreement shall be for the
account  of  Sellers.  Notwithstanding  the  foregoing  all  of  the  legal  and
accounting  fees  incurred  by Sellers  and USDT prior to closing may be paid by
USDT from USDT at the time of closing, but not in excess of $5,000.00.

          12.3 Amendment;  Waiver. This Agreement may not be modified,  amended,
supplemented,  cancelled or discharged, except by written instrument executed by
all of the parties.  No failure to  exercise,  and no delay in  exercising,  any
right,  power or privilege under this Agreement  shall operate as a waiver,  nor
shall any single or partial exercise of any right, power or privilege  hereunder
preclude the exercise of any other right,  power or privilege.  No waiver of any
breach of any  provision  shall be deemed  to be a waiver  of any  preceding  or
succeeding  breach of the same or any other  provision,  nor shall any waiver be
implied from any course of dealing between or among the parties. No extension of
time for  performance  of any  obligations  or other acts hereunder or under any
other  agreement  shall be deemed to be an extension of the time for performance
of any other  obligations  or any other  acts.  The rights and  remedies  of the
parties  under this  Agreement are in addition to all other rights and remedies,
at law or equity, that they may have against each other.

          12.4 Binding  Effect;  Assignment.  The rights and obligations of this
Agreement  shall  bind  and  inure  to the  benefit  of the  parties  and  their
respective  successors  and legal  assigns.  The rights and  obligations of this
Agreement  may not be assigned by any of the parties  without the prior  written
consent of the other parties.

          12.5  Counterparts.  This  Agreement  may be executed in any number of
counterparts, each of which shall be an original but all of which together shall
constitute one and the same instrument.

          12.6  Headings.  The  headings  contained  in this  Agreement  are for
convenience of reference only and are not to be given any legal effect and shall
not affect the meaning or interpretation of this Agreement.

          12.7 Governing Law; Interpretation.  This Agreement shall be construed
in  accordance  with and governed for all purposes by the laws and public policy
of Delaware  applicable to contracts  executed and to be wholly performed within
such State.

          12.8 Severability. The parties stipulate that the terms and provisions
of this  Agreement  are fair and  reasonable  as of the date of this  Agreement.
However, if notwithstanding that stipulation the terms and provisions of Section
4.1 relating to  non-competition  and  confidentiality  shall be determined by a
court of  competent  jurisdiction  to be  invalid,  void or  unenforceable,  the
remainder of the terms, provisions, covenants and restrictions of this Agreement
shall remain in full force and effect and shall in no way be affected,  impaired
or invalidated.  If,  moreover,  any of those provisions shall for any reason be
determined  by a court of competent  jurisdiction  to be  unenforceable  because
excessively  broad or vague as to  duration,  geographical  scope,  activity  or
subject, it shall be construed by limiting, reducing or defining it, so as to be
enforceable.

                                    Execution

          The  parties,  intending  to be  legally  bound,  have  executed  this
Agreement or have caused this Agreement to be executed by their duly  authorized
representatives as of the date first above written.



                                   AVITAR, INC.


                                   By



                                   UNITED STATES DRUG TESTING
                                   LABORATORIES, INC.



                                   By



                                   SELLERS:




                                   DOUGLAS LEWIS




                                   VERONICA LEWIS


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