America's Shadow War On Drugs

MEXICO CITY, Mexico — The shady figures set up bank accounts in false names and fill them with drug money. They keep convicted criminals on their payroll, and watch guns smuggled over the border. And for those wanting to transport cocaine, they have trucks and ships available.

But these clandestine operators are not drug traffickers. They are the American agents paid to bust them.

As Mexico suffers from its worst drug violence in history, a series of scandals have erupted over American agents fighting the war against Mexican cartels on the frontline.

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