Including alcoholics. Make it mandatory if they commit a crime while under the influence, or to pay for their next fix. We don't want these people breeding. They haven't got what it takes to be adequate parents, never mind a prenatal environment that is quite literally poisonous. Also, a certain segment of them are more than a bit inbred, in the genetic sense.
I don't think this idea will catch on though. Our society isn't ready for it yet.
Plus, there's this vague nagging doubt in the back of my mind. Something about a slippery slope, and the Nazi era in Germany...