The whole drunk driving thing is way overblown. Just another excuse for the cop state. Those laws stop drunks about as often as gun control stops criminals, and they both have the the same unconstitutional assumption- that because someone MIGHT injure another, that pro active measures are warranted against all. If someone causes an accident, then charge them and try them.
And they share another similarity as well, since they don't work to start with, the laws keep getting more and more restrictive-if they keep it up ,soon your aftershave will push your blood alcohol content "over the limit".