“The scale of the problem was enough to overwhelm entire agencies, much less one investigator like Buemi. Yet his contact with Li Li offered a starting point. Looking through the catalog of drugs on offer, Buemi saw Molly — but he also saw pills containing a mix of oxycodone and something called acetyl fentanyl, dyed and pressed to look like legitimate prescription pain pills. Buemi had a hunch that the same drug ring responsible for moving Molly into South Florida might also be importing the acetyl fentanyl pills. He placed an order for both.” NYT Mag: The China Connection: How One D.E.A. Agent Cracked a Global Fentanyl Ring.