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According to Wikipedia, the DEA gave him immunity on additional charges in return for pleading guilty and running a sting against his associates, but before the DEA knew about the murders.
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Seems weird that the DEA can even give him immunity unknown crimes, especially ones that might not be directly related to the case and even weirder that they would offer that. Makes you wonder what kind of leverage/information you have to have to get that kind of plea deal.
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