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Associated Press
In this Tuesday, Dec. 11, 2012 photo, Jack Riley, left, head of the Drug Enforcement Administration in Chicago, discusses local Mexican drug cartel problem areas, in the new interagency Strike Force office accompanied by DEA agent Vince Balbo. The first-of-its-kind drug enforcement headquarters has opened in Chicago where 70 federal agents, local police and prosecutors work side-by-side, all year round to fight drug trafficking - a set-up meant to end inter-agency rivalry and miscommunication that can plague investigations. The opening of the Chicago Strike Force office comes as Mexican traffickers have taken control of more than 90 percent of the drugs market in Chicago, which the syndicates also use as a hub for distribution across the Midwest, the DEA says. (AP Photo/M. Spencer Green)

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