In a 1990 letter to Bill Bennett:
You are not mistaken in believing that drugs are a scourge that is devastating our society. You are not mistaken in believing that drugs are tearing asunder our social fabric, ruining the lives of many young people, and imposing heavy costs on some of the most disadvantaged among us. You are not mistaken in believing that the majority of the public share your concerns. In short, you are not mistaken in the end you seek to achieve. Your mistake is failing to recognize that the very measures you favor are a major source of the evils you deplore. Of course the problem is demand, but it is not only demand, it is demand that must operate through repressed and illegal channels. Illegality creates obscene profits that finance the murderous tactics of the drug lords; illegality leads to the corruption of law enforcement officials; illegality monopolizes the efforts of honest law forces so that they are starved for resources to fight the simpler crimes of robbery, theft and assault. Drugs are a tragedy for addicts. But criminalizing their use converts that tragedy into a disaster for society, for users and non-users alike. Our experience with the prohibition of drugs is a replay of our experience with the prohibition of alcoholic beverages.
A voice of, and for, reason, Milton Friedman will be much missed.