Practically speaking, I see no indication that any prohibition laws work. If people want something they'll get it. In the time of the Volstead Act, you could buy drinkin' alcohol in pretty much any town in the US. I read Henry Miller when his books were illegal. You can get guns in the UK & in New York City. You can get illicit drugs even in jail. Before Roe vs Wade there were abortions.

People will even make their own drugs, porn, zip guns -- does anyone remember those? -- if all else fails. Homemade drugs and abortions are particularly bad.

And the people you are trying to keep these things from are the ones most likely to seek them out.

Clint