one of the really bad, annoying aspects of doing drugs is the lack of quality control

Exactly. But they probably have a lot of prisoners that are in prison on petty drug charges that if they were released because they decriminalized drugs, would cause them to have their findings cut. That is the only reason why they are stuck on a war on drugs that has neve worked, will never worked, and opened to door to a whole load of other chemicals that are much more dangerous because people wanted to get around the legality of drug use.