I found an article from CBC in 2017 that had this. I'm not sure if laws have changed since then, though:
What about intoxication and consent?
Intoxication is also considered a factor that affects a complainant's capacity to consent to sexual activity.
But in practice, Benedet said, the threshold of intoxication at which point someone is deemed incapable of consent varies depending on the circumstances.
Where a complainant becomes intoxicated involuntarily, for instance, by being drugged, "courts [tend] to be very generous in terms of what level of intoxication would be sufficient to amount to incapacity."
If a complainant consumes drugs or alcohol by choice, courts have "a very high threshold for incapacity, much higher than they would have applied in those involuntary intoxication cases."
'Clearly, a drunk can consent'
While Lenehan's comment has sparked outrage in much of the public, he's not incorrect according to Canadian case law.
"You can find many criminal decisions that use the line 'a drunken consent is still a consent,' and I do think … Canadian law is reluctant, and in my view too reluctant, to find that intoxication can vitiate consent," said Benedet.