I don't know what the law is in other countries, but if you were odd enough to own a pub and put a 3-drink limit on all your patrons, I imagine that would be OK in Ontario the Good. The law here is that you're not supposed to serve someone, in either a bar or a liquor store, who appears to be already intoxicated. A law which of course has widely varying application.

A bartender or server (or party host) is not 100% liable for the actions of someone after they have been served alcohol, but there is a definite liability factor involved. Most interesting case recently was a woman who sued her own company after she got drunk at the office Christmas party, drove away, and caused an accident. (I don't remember her name, but try searching in Google for liability and chutzpah, that oughtta find it!)

But I think you should go for it. I'm fully in favour of having a nice, friendly, moderation-encouraged pub in every town. In the real world, the drinking places that cause problems are the ones that keep on juicing you when you're obviously hammered. They're pretty easy to spot, just step inside one and you'll know you won't want to stay long.

Willie-O
think I'll be off to the pub for lunch soon
batching it this week