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In this photo released by the U.S. Drug Enforcement Agency, DEA, and taken on Oct. 21, 2016, a sample of carfentanil is being analyzed at the DEA’s Special Testing and Research Laboratory in Sterling, Va. China is adding the deadly elephant tranquilizer carfentanil and three related synthetic opioids to its list of controlled substances effective March 1, China's National Narcotics Control Commission said Thursday. (Russell Baer/U.S. Drug Enforcement  Administration via AP)

In this photo released by the U.S. Drug Enforcement Agency, DEA, and taken on Oct. 21, 2016, a sample of carfentanil is being analyzed at the DEA’s Special Testing and Research Laboratory in Sterling, Va. China is adding the deadly elephant tranquilizer carfentanil and three related synthetic opioids to its list of controlled substances effective March 1, China's National Narcotics Control Commission said Thursday. (Russell Baer/U.S. Drug Enforcement Administration via AP)

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