I believe there was a congressman from Kentucky, or somewhere else in the states that said the same thing, Highwaystar.
Essentially it was 'if you want government money, you need to allow government intervention' by taking a urine sample.
I would be all for it. I really don't like the idea of government intruding more into people's lives (and forcing urine samples does that), but at the same time, if your taking government money to live, then you shouldn't feel like your living a free life, either.
@SciFiBoy - I don't think anyone is arguing that if they fail the test, they get thrown out on the street. If anything, them failing would force them into a position to be rehabilitated. The government can't act as the enabler of bad habits.
Back from the dead, I'm afraid.