I can honestly say I've never driven with alcohol in my system, but only for one simple reason. I don't drink; period. I didn't drink in high school, and didn't drink in college. Now that I'm a few years out of college, I can count on two hands how many drinks I've had.
Some may say that's a load of BS. The main reason I don't drink is that I grew up with an alcoholic... I've seen enough alcohol and booze to last my entire life; and I wish to see no more. Another reason that helps affirm not drinking, is that I'm on call 24/7, and I don't like the idea of hearing my pager go off, and know that I'm not there to help someone because I have alcohol in my system. Our department has a "no alcohol" clause, and we cannot be under the influence while at a scene. Some evenings we can be pretty short staffed, and I wouldn't feel right knowing that there wasn't enough help at a call, or wondering if better results for the victim(s) would have been available had I been there.
Now if I were to tell you I've never driven over the speed limit, or raced on public roads, I would never be able to keep a straight face. I don't do near what I used to, but I still give an occasional scary ride in a car, semi, or whatever else I can find to have fun in on the road.

Anyhow... What I trying to get it, is that not EVERYONE has done EVERYTHING. People have their right to be their own person, and whether that means doing something stupid, or being just an average guy, or being a saint (I've yet to meet one), they still have their right to be themselves. For that reason I can't chastise someone for doing something that I think is foolish, and I would hope they won't chastise me for not knowing who I am, and what I do or don't do.
Nic