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U.S. Agencies Infiltrating Drug Cartels Across Mexico

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A member of Mexican Federal Police is pictured overflies as he patrols Acapulco, Guerrero State, on October 16, 2011. | Getty

WASHINGTON -- American law enforcement agencies have significantly built up networks of Mexican informants that have allowed them to secretly infiltrate some of that country's most powerful and dangerous criminal organizations, according to security officials on both sides of the border.

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