 Arrests of key cartel leaders, particularly in the Tijuana and Gulf cartels, have led to increasing drug violence as cartels fight for control of the trafficking routes into the United States.Federal law enforcement has been reorganized at least five times since 1982 in various attempts to control corruption and reduce cartel violence.During that same period, there have been at least four elite special forces created as new, corruption-free soldiers who could do battle with Mexico's endemic bribery system.