Sharyl Attkisson
CBS News
October 26, 2011

A Mexican drug suspect awaiting trial in Chicago is making a startling claim. He insists he can’t be prosecuted because he worked as an informant and had a secret immunity deal with the U.S. government.

Prosecutors say Vicente Zambada-Niebla oversaw drug running on a massive scale into the U.S. But now, from behind bars at a maximum security prison in Chicago, he’s making his own explosive accusations — that U.S. government agents have been aiding Mexico’s infamous Sinaloa cartel — even tipping off leaders on how to avoid capture.

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