The use or possession of many drugs is currently a criminal offense in the U.S. Can these criminal laws be justified? What are the best reasons to punish or not to punish drug users? These are the fundamental issues debated in this book by two prominent philosophers of law. Douglas Husak argues in favor of drug decriminalization, by clarifying the meaning of crucial terms, such as legalize, decriminalize, and drugs. Peter de Marneffe argues against drug legalization, demonstrating why drug prohibition, especially the prohibition of heroin, is necessary to protect youth from self-destructive drug use.