5 things to know about America's synthetic-opioid epidemic

In this Aug. 9, 2016, photo, a bag of 4-fluoroisobutyrylfentanyl, which was seized in a drug raid, is displayed at the Drug Enforcement Administration (DEA) Special Testing and Research Laboratory in Sterling, Va. A novel class of deadly drugs is exploding across the country, with many manufactured in China for export around the world. The drugs, synthetic opioids, are fueling the deadliest addiction crisis the U.S. has ever seen. (AP Photo/Cliff Owen)WASHINGTON (AP) — Government scientists say they’re seeing the emergence of a new class of deadly drugs built to mimic the potent prescription painkiller fentanyl. What you need to know:

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