Not-such-better-living through chemistry
It's interesting to note that as methamphetamine and amphetamine were more regulated in the 50s and 60s, it became more prevalent. Then in order to stamp out illegal production, the precursor chemicals were monitored. So what happens? Production becomes more dangerous.Solution: Just make every kind of drug legal to produce, but regulate the purity. Be very explicit about the dangers. The only thing prohibition does is make drug consumption and production dangerous and needlessly expensive.