With so many TF members throwing out the numbers for BAC in their respective regions I thought I'd include the legal limit here in Colombia, South America. The BAC limit is .02% (that's basically one beer) and the legal drinking age is 18 y/o.
I will add that Colombians, as a whole, drink more than I've ever seen people drink. Here when they go out they don't order a drink or two, they order a bottle or two or three. Surprisingly, there are very few drunk driving accidents due to fact that they know that there are always numerous sobriety check points randomly placed throughout the area on the weekends when most of the drinking happens. Another reason would be that the monetary fine for drinking and driving is 50 times the minimum monthly salary. Try that in the good ol' usa!