The prohibition on self-induced intoxication defences for offences of violence was determined to be unconstitutional and of no force or effect.
Section 33.1 will exclude intoxication as a defence for general intent offences or involuntariness due to intoxication where the following conditions are met:
- the accused was intoxicated at the time of the offence;
- the intoxication was self-induced; and
- the accused departed from the standard of reasonable care generally recognized in Canadian society by interfering or threatening to interfere with the bodily integrity of another person
This section applies to any mental condition that arises directly from a state of intoxication, including toxic psychosis.
There is "no specific level of intoxication associated with either the defence of extreme intoxication [under s. 33.1] or negating the intent for second degree murder".
Where both s. 33.1 and common law intoxication defences are at issue, it is "preferable for the trial judge to have explicitly instructed the jury that the level of intoxication required to negate the specific intent to kill could be less than intoxication akin to automatism".
In Ontario, s. 33.1 was found to be unconstitutional for violating s. 7 and 11(d) of the Charter and is of no force or effect.
- R v Sullivan, 2022 SCC 19 (CanLII), per Kasirer J
- R v Bouchard-Lebrun, 2011 SCC 58 (CanLII),  3 SCR 575, per LeBel J
- Bouchard-Lebrun, ibid.
R v Jensen, 2005 CanLII 7649 (ON CA), 195 CCC (3d) 14, per Simmons and Laforme JJA, at para 22
- Jensen, ibid., at para 22
R v McCaw, 2018 ONSC 3464 (CanLII), 48 CR (7th) 359, per Spies J
Where the accused raises the defence of both intoxication and provocation in the context of a murder trial, the judge must ensure that the jury does not confuse the differences between the two defences. A jury should be instructed on intoxication first, specifically on the logical connection between intoxication and the relevant intent for murder. If intoxication raises a doubt, then provocation does not need to be considered. It is only where the requisite intent for murder is found should the jury then consider whether provocation applies. Any instruction on provocation should include consideration of the effect any intoxication may have on the accused.