FILE - In this March 6, 2017 file photo William Brownfield, assistant secretary for International Narcotics and Law Enforcement Affairs, speaks during a joint press conference with Guatemala's President Jimmy Morales at the inauguration of a women's jail in Fraijanes, Guatemala. The United Nations is about to clamp down on fentanyl, a prescription painkiller up to 50 times stronger than heroin by adding it to its list of controlled opioids. (AP Photo/Moises Castillo,file )
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