McEwan v. Canadian Hockey League
draw the inference, that is, form the opinion; and (4) the opinion is a
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compendious mode of speaking and the witness could not as
accurately, adequately and with a reasonable facility describe the
facts she or he is testifying about. But as such evidence approaches
the central issues that the courts must decide, one can still expect an
insistence that the witnesses stick to the primary facts and refrain
from giving their inferences. It is always a matter of degree. As the
testimony shades towards a legal conclusion, resistance to
admissibility develops.
…
[16]
… In Graat, the Supreme Court of Canada ruled admissible lay
opinion evidence about whether a person’s ability to drive was impaired by
alcohol. The witnesses in question all had an opportunity for personal
observation, and the opinion was based on perceived facts as to the manner
of driving and the indicia of intoxication of the driver. These witnesses were in
a better position than the trier of fact to determine the degree of impairment
and could give the court real help. The court noted at pages 837-838:
It is well established that a non-expert witness may give evidence that
someone was intoxicated, just as he may give evidence of age,
speed, identity or emotional state. This is because it may be difficult
for the witness to narrate his factual observations individually.
Drinking alcohol to the extent that one’s ability to drive is impaired is a
degree of intoxication, and it is yet more difficult for a witness to
narrate separately the individual facts that justify the inference, in
either the witness or the trier of fact, that someone was intoxicated to
some particular extent. If the witness is to be allowed to sum up
concisely his observations by saying that someone was intoxicated, it
is all the more necessary that he be permitted to aid the court further
by saying that someone was intoxicated to a particular degree.
… Nor is this a case for the exclusion of non-expert testimony
because the matter calls for a specialist. It has long been accepted in
our law that intoxication is not such an exceptional condition as would
require a medical expert to diagnose it. An ordinary witness may give
evidence of his opinion as to whether a person is a drunk. This is not
a matter where scientific, technical, or specialized testimony is
necessary in order that the tribunal properly understands the relevant
facts. Intoxication and impairment of driving ability are matters which
the modern jury can intelligently resolve on the basis of common
ordinary knowledge and experience. The guidance of an expert is
unnecessary.
[58] The defendants say this exception does not apply to any of the impugned
passages of the Players’ affidavits for a number of reasons.
[59] With regard to what the defendants say are the Players’ statements that they
were trained, encouraged, and commended to be an enforcer, they submit those