A medical examiner announced on Thursday that music legend Prince died of a self-administered dose of the synthetic opioid fentanyl, unleashing a torrent of headlines about the dangerously powerful narcotic that is “sweeping
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Photo Illustration by The Daily Beast 
How Knockoff Fentanyl Dodges Cops
GRAY AREA
The synthetic opioid that killed Prince is part of a tangled international network of copycat drugs, and it’s impossible for authorities to keep up.
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