A police officer holds a bag of heroin that was confiscated as evidence in Gloucester, Mass., in March. Massachusetts is one of 38 states that allow civil commitment for substance abuse.
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A Bulgarian border policeman stands near a barbed wire wall on the border with Turkey in July 2014. Experts believe that about two-thirds of the heroin that enters Europe comes through Bulgaria, and that a third of that moves on to the United States.
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