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    Will Trump's wall stem flow of drugs into US?

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Will Trump's wall stem flow of drugs into US?

CNN's Sanjay Gupta looks into whether President Donald Trump's wall will help stop heroin -- and fentanyl, which is 50 times stronger than heroin -- getting into the US.

Will Trump's wall stem flow of drugs into US?

CNN's Sanjay Gupta looks into whether President Donald Trump's wall will help stop heroin -- and fentanyl, which is 50 times stronger than heroin -- getting into the US.