How El Chapo’s Man in Chicago Became a Police Consultant

BILLINGS, Mont.—Margarito Flores has the jitters. Once one of the top kingpins in the U.S. for Mexico’s Sinaloa cartel, he is starting a second career—teaching law-enforcement officers how to catch drug traffickers. Slight of build, with short cropped hair, Flores darted back and forth at the…

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