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In this Aug. 9, 2016, file photo, a bag of 4-fluoro isobutyryl fentanyl that was seized in a drug raid is displayed at the Drug Enforcement Administration (DEA) Special Testing and Research Laboratory in Sterling, Va. (AP Photo/Cliff Owen, File)
Photo by: Cliff Owen
In this Aug. 9, 2016, file photo, a bag of 4-fluoro isobutyryl fentanyl that was seized in a drug raid is displayed at the Drug Enforcement Administration (DEA) Special Testing and Research Laboratory in Sterling, Va. (AP Photo/Cliff Owen, File)

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