.08 % blood Aclohol. It takes more alcohol (drinks) for a larger person to get to a .08 BAC level than a smaller person. Also .08 is not that impaired really, of course it depends on the person, circumstanses i.e. time elapsed, food consumed, biochemistry, ect.. For instance, if I have 3 beers in an hour I will be right about that level. Some bars have BAC testers, which is cool! I didnt google, just some of this stuff from past experiences... unfortunetly.