The war on drugs has failed. And it's high time to replace an ineffective strategy with more humane and efficient drug policies. This is the central message of the report by the Latin American Commission on Drugs and Democracy we presented to the public recently in Rio de Janeiro.

Prohibitionist policies based on eradication, interdiction and criminalization of consumption simply haven't worked. Violence and the organized crime associated with the narcotics trade remain critical problems in our countries. Latin America remains...