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Stewart, a former agent for the Bureau of Diplomatic Security, gathers intelligence on the cartels for Stratfor, a Texas-based security consulting firm that helped document Guzman's worth.
CNN: Stakes rise as drug war threatens to cross border
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Unnamed officials speaking to the New York Times questioned whether Bureau of Diplomatic Security officials had the authority to offer such deals - making the legal validity of the offers unclear.
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The FBI took over the investigation earlier this month, after the justice department realised it would not be able to bring charges based on the guards' statements to the Bureau of Diplomatic Security, reported AP.
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