I understand and respect your position on this. Even though I am a frequent drinker, I would probably support a zero tolerance policy, as it just makes more logical sense than saying "you can only drink so much and it's your personal responsibility to just kinda eyeball it and hope you're right." Or maybe if every vehicle had an interlock... or something. But what I will say is that those "simulated drinking" things are not very accurate. They'll strap on those goggles and say "this is what it's like to have two beers," and then you realize as a man between 170-200 lbs that the effect of drinking two beers practically has zero effect on you. Again, that's not an excuse for anyone, but there's such a wild difference in the size of people, their tolerance, the % content of "one beer" and other factors that mean there's not really a 100% empirical level of impairment, which can lead to a lot of issues. In the situation where I'm a frequent drinker, consuming the same amount of alcohol vs. someone who did not ever consume, would have a wildly different effect.