The NTSB recommends dropping that to a BAC level of .05.

[Clint45]

People are sometimes effected by low BAC due to body weight, metabolic rate, genetics, or an empty stomach . . . but few people would be significantly impaired an hour after drinking a single beer or glass of wine. A single dose of a cough syrup like NyQuil could put you over the lowered limit, as could driving with a hangover. I think the NTSB should focus on texting drivers instead . . . they are a far worse problem . . . or how about stripping schizophrenics of driver licenses . . . perfectly legal for psychotics and even the mentally retarded to have a driver license once they manage to pass the written test on their 10th attempt and the driving test on their 5th try. And what about octogenarians who are now either legally blind or suffering from dementia? Those people are real hazards. Going after someone who had a beer with dinner or had some NyQuil under "zero tolerance" at random checkpoints is bullshit . . . if they were involved in an accident, that's a different story.