Situated on major drug trafficking routes that bring heroin, cocaine, and methamphetamine from Mexico into the United States, Tijuana and Juarez experience high rates of local drug use and rank first and second, respectively, in prevalence of illicit drug use within the country. Sex tourism is another feature shared by Tijuana and Juarez. Both cities have 'tolerance zones' where sex work is openly practiced and, in the case of Tijuana, even regulated by the authorities