What I Know and Want to Know

I know that when you drink and drive, a lot of things can happen. If you're lucky, you get home without getting in any sort of confrontation. If you're even luckier, you get stopped by a cop to set yourself straight. But if you're not-so-lucky, you may total your car. But even worse, you may kill someone or yourself, even worse than that, you may kill someone and have to live with it. Current standards for drinking and driving are strict. In the state of Maryland, if you get caught with a BAC (blood alcohol concentration) of .02 or more, you're in a world of trouble. The police can do all sorts of things like sobriety tests (walk on the line on the side of the road, say the ABC's backwards), or they could take you to the station and whip out the breathalyzer. When you register for a license, you sign a form that guarantees a breathalyzer, but you may choose to go to the police station to take it. One thing that I learned in driver's ed. is that the worst way to learn about drinking and driving is by experiencing it, so don't do it.
There are a couple of things that I would like to know about the rules of enforcing drinking and driving.
I know about Maryland's standards, but are there any different standards in other states? I would also like to know how these standards are received by drivers, are they too loose or strict? What about the political status of this issue? Are people trying to change regulations? Are there any social issues within this? Are people treated differently because of their race, sex, or age? What age group of people break these laws more often? Are the punishments of this crime different with the severity of the act? Drinking and Driving is an extreme crime, but the influence of it on America is even more extreme.