 Six of the implicated officers had received U.S. training as part of the Grupo Aeromóvil de Fuerzas Especiales (GAFE) training program.As a result of "spillover" along the U.S.-bound drug trafficking routes and more stringent border enforcement, Mexico's northern border states have seen increased levels of drug consumption and abuse, including elevated rates of drug injection 10 to 15 times the national average.These rates are accompanied by mounting rates of HIV and STIs among injection drug users (IDUs) and sex workers, reaching a 5.5% prevalence in cities such as Tijuana and Ciudad Juárez, which also report STI rates of 64% and 83%, respectively.