This essay examines the impact of U.S. and Colombian government drug control policies on the evolution of drug cultivation, drug trafficking, and political violence in Colombia during the 1990s. Its central thesis is that the Washington/Bogota-backed war on drugs in Colombia over the decade did not merely fail to curb the growth of the Colombian drug trade and attendant corruption, but actually proved counterproductive. Among the most important unintended consequences were the explosion of drug cultivation and production activities, the dispersion and proliferation of organized crime, and the expansion and intensification of political violence and guerrilla warfare in the country.