Prisons have a problem with drugs in their populations. They can't stop drugs in a place where prisoners are locked in a room, can be searched at any time and contact with the outside is monitored.
If they can't stop it in prisons, how are they going to stop it across the country? Even if they put everyone in prison, it won't work, please see first sentence.
My final point about alcohol, about drugs, about pornography; what business is it of yours what I do, read, buy, see, fuck or take into my body as long as I don't harm another human being whilst on this planet? And for those of you having a little moral dilemma on how to answer this, I'll answer for you. None of your fucking business! Take that to the bank, cash it and take it on a vacation outta my fucking life. ~ Bill Hicks