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Anna Sirianni

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A top official with the U.S. Drug Enforcement Administration tells NPR efforts to target drug cartels in Mexico have unraveled. The culprit is a diplomatic route that's frozen joint investigations and intelligence sharing between the two countries. This comes at a time when cartels are shipping more and more fentanyl into the U.S., driving a record spike in overdose deaths. NPR addiction correspondent Brian Mann reports.

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