A bag of 4-fluoro isobutyryl fentanyl which was seized in a drug raid is displayed at the Drug Enforcement Administration (DEA) Special Testing and Research Laboratory in Sterling, Va., on Aug. 9, 2016. China on Friday, July 7, 2023, insisted it is up to the U.S. to “create necessary conditions” for anti-drugs cooperation, following complaints from Washington that Beijing has ignored its calls for a crackdown on precursor chemicals for the highly addictive painkiller fentanyl. (AP Photo/Cliff Owen, File)
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