When anything that people might want is outlawed it creates a black market in that product or service. Those people who supply that product or service become rich enough to be able to corrupt Law enforcement and government. Those people who supply that product or service support the continued prohibition of those products or services so they can continue to make money from the uncontrolled sales. To that end they become the biggest supporters of Right Wing Law and order politicians who then can't prosecute them for fear of exposure of where their campaign funds came from. The medical and pharmaceutical industries enter into this by developing and dispensing more kinds of abusable drugs which are eventually outlawed adding to black market, medical and pharmaceutical profits



