[Dalewyn]

I speak from experience and what I've heard.

The police are almost never going to police restaurants, bars, wineries, and other such places even though there will obviously be plenty of potential drunk drivers to arrest. Meanwhile, a friend who parted ways with me after a night out stopped by a liquor store on the way home and was questioned and subsequently arrested (he was legally drunk) as he came out.

The point of this story is that the law states absolutely clearly that noone is allowed to drink and drive. On the other hand, practicality and reality means police will turn a blind eye to certain areas while enforcing the law elsewhere; knowing this is how the real world works is handy and important for what I hope are obvious reasons.