"Many studies have shown that impairment begins in the .04 range. The point where most rational people wouldn't even think of driving is around .06, in my experience (I have access to a portable breath testing device). The reason so many cops are gung ho about removing impaired drivers from the roads is because they see the daily carnage they cause."
Total MADD BS Propaganda!!!
I have a cousin that is 6'4" and weighs 250 and I would feel very safe with him driving me home after drinking a case of beer.
Some people just metabolize alcohol better than others.
Some may be impaired at .06 while others are not impaired at .10 !
Face it it's just a revenue generator in cases where drivers are arrested with BAC less than .08.
Thats the truth - my wife drives better in traffic or bad weather after 2 or 3 drinks.