While I don't think this is a bad thing I do think that the effort could be better spent catching the drivers who intentionally drink way over the limit and drive. This small percentage cause way more harm than those that have between 50-80mg. Another area is people driving sleep deprived. Read an article saying that someone who hasn't slept in 24hrs has slower reactions than someone who has drank a half bottle of vodka. Drove when absolutely shattered before coming off night shift etc but wont do it again, so dangerous.