In this June 27, 2016, file photo provided by the Royal Canadian Mounted Police, members of the RCMP go through a decontamination procedure in Vancouver after intercepting a package containing approximately 1 kilogram (2.2 pounds) of the powerful opioid carfentanil imported from China. U.S. assertions that China is the top source of the synthetic opioids that have killed thousands of drug users in the U.S. and Canada are unsubstantiated, Chinese officials told the Associated Press. (Royal Canadian Mounted Police via AP, File)
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