You're asking a question about a criminal offence under the law. The first thing you should know—before even asking—is that in English North America there are fifty two different codes of criminal law. In Canada we have one Criminal Code that covers the entire country, but in the Excited States each of the fifty states makes its own criminal laws, and the feds have made a few over the years as well. Nothing says there's anything common to the fifty two different laws covering any crime, including rape. In Canada we haven't even had an offence that's called that for years.
The finer points of laws—like when a person is too out of their gourd to even put a criminal thought together, or to have the foggiest notion of what they missed their chance to say no to—are almost always defined by judges in courtrooms, because the lawbooks can't be big enough for all such details. Since a judge covers only a smallish bit of a state, province or country, those fine points, like how drunk is drunk, are defined for small areas only until an appeal court that covers a bigger area lays down a wider version. But there is no court that covers both Canada and the US. So whose law, where, are you asking about? TERB may have Toronto in its name but the interweeb has no geography.
If all you're really wanting is a guidline to safe and appropriate behaviour with a tipsy date: Unless you're sure she'll remember giving consent, and will only have happy memories of the conjunction to follow, the only safe answer to hear is 'no'. Not only does No Mean No, but the only thing that means yes is a clear, unequivocal 'Yes'.
If you have to ask whether you just got a real yes, then you didn't.