.08 is .08.
tyme-
.08 BAC is .08 regardless of body weight. It refers to the percentage of blood volume that is pure alcohol. It takes the heavier person more drinks (if all other factors -amount and type of food in stomach, level of dehydration, type of drink being consumed, rate of consumption for example- are equal) to reach .08% BAC than the lighter person since they have more blood to dilute, but once at a given BAC the level of imparement is consistent. The experienced drinker has learned to compensate for their usual level of intoxication so as not to appear drunk, but their reaction times are impared to the same average degree. VERY experienced drinkers develop a tolerance that enables them to appear less intoxicated than they in are, however, their reaction times are still impared.
There is some variability in how individuals and racial groups process alcohol. There are individuals whose livers break down alcohol more efficiently than others. (I think the rate is around 1 oz an hour.) It would take such an individual more drinks to reach a given BAC. At the other extreme, I read about a case in Japan, I think it was, back in the early '70's when some poor schmuck was pulled over with a .2something. He swore he had not been drinking. After being in jail for 24 hours, his BAC was still the .2something. Turned out that his liver was MAKING alcohol, so that was the normal condition for him. Sounds like an urban legend doesn't it? I was taking a graduate class in alcohol problems when I found this article in a journal the name of which I have long since forgoetten, so I can't verify its veracity.
Pax Americana,
Joe