Well, a recent example is the banning of meow-meow after someone allegedly died of it. The law was passed then a bit later the coroner reported that the drug was nothing to do with it. A lot of people criminalized for no reason, and instead of buying 99% pure drugs from the Internet, people instead bought 30% pure drugs cut with God knows what from a dodgy geezer in a club toilet in Brixton. Nice one Nu Labour.