COWPAT - do you not understand that having a trace of alcohol in your blood, in a zero tolerance regime, is very different to being "worse for wear"? To be completely sure of passing a blood test, you would need to go without a drink for a week.
My point is that many of us feel much, much worse through fatigue than we ever do after 1 or 2 glasses of wine. I completely agree with the rest of your post.