CHICAGO (AP) — The head of the Drug Enforcement Administration's Chicago division, who has drawn attention to the growing influence of Mexican cartels in the American heartland, is leaving to take one of the agency's top posts in Washington, D.C., a DEA official said Tuesday. At the new facility, federal agents, police and prosecutors work together year-round, often targeting the point of contact between cartel-backed traffickers and local gangs who serve as street-level salesmen. In 2013, Riley joined the non-governmental Chicago Crime Commission in naming Sinaloa cartel boss Joaquin "El Chapo" Guzman, as the city's new Public Enemy No.