> The legal blood alcohol limit in basically any developed country is usually so low that people can readily hit it with a drink or two without feeling any sort of intoxication from it

a lot of places have basically zero tolerance to drinking and driving. here in brazil, anything higher than 0.05mg/l is subjected to fine and inability to drive for 12mo. [0]

so, even if you had one beer, you need to take a cab back home.

[0] http://www.loc.gov/lawweb/servlet/lloc_news?disp3_l205403471...