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U.S. Focuses on Heroin-Supplying Countries

Heroin in the United States is cheaper and purer than perhaps ever before, creating a growing addiction crisis in communities not typically associated with the drug. John Walters, director of the Office of National Drug Control Policy, says federal officials are trying to curb the supply of heroin by targeting countries, such as Mexico and Colombia, that supply it. Hear Walters and NPR's Bob Edwards.

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