Diminished Intelligence and the Partial Defence of Provocation
Under s. 232 of the Criminal Code,
homicide that would otherwise be murder may be reduced to manslaughter if the
person who committed it did so in the heat of passion caused by sudden
provocation. There are two essential components to the requirements of s. 232–
one objective, the other subjective.
Ordinary person inquiry
First, there must
be a wrongful act or insult of such a nature that it is sufficient to deprive
an ordinary person of the power of self-control as the objective element.
Accused Person inquiry
Second, the
subjective element requires that the accused act upon that insult on the sudden
and before there was time for his passion to cool.
R. v. Tran, 2010 SCC 58, [2010] 3 S.C.R. 350, at
para. 23;
R. v. Thibert, [1996] 1 S.C.R. 37.
Contextualizing
the Ordinary Person Standard Versus Individualizing It
Personal circumstances may be relevant to
determining whether the accused was in fact provoked – the subjective element
of the defence – but they do not shift the ordinary person standard to suit the
individual accused. In other words, there is an important distinction between
contextualizing the objective standard, which is necessary and proper, and
individualizing it, which only serves to defeat its purpose.
Care must be taken not to subvert the
logic of the objective test because if all of the accused’s characteristics
are taken into account, the ordinary person becomes
the accused.
Tran, at para 33.
In R.
v. Berry, 2017 ONCA 17 the Court of Appeal for Ontario concluded that the accused’s
diminished mental capacity (5th percentile) was an individual
personal characteristic and thus potentially relevant within the subjective component
of the provocation analysis, but was not necessary for the purpose of “contextualizing”
the wrongful act or insult within the ordinary person analysis.
The Court’s conclusion fits with the postulate
provided by the expert witness in R. v.
Berry: that while an intelligence test provides an indication of what a
person’s optimal level of functioning is, under clinical observations, how a
person applies their intelligence in day-to-day life when they’re confronted
with problems or stressful circumstances may be another thing and that is
determined more by an individual’s personality.
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