New: We spent time with the DEA in Phoenix, where drug warriors who have spent years trying to slow the flow of fentanyl say Trump’s policies are helping.
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Inside the DEA's battle against fentanyl smugglers along the border
Federal officials say as much as 60 percent of all fentanyl brought into the U.S. comes through Phoenix, and now the Drug Enforcement Administration is ramping up resources to stop it. NBC News' Ken D...
