It's the opioid that killed Prince, and it's 50 to 100 times more potent than morphine.
In the latest example of how just touching its residue can be dangerous, a police officer in East Liverpool, Ohio, collapsed and was rushed to the hospital after he touched some fentanyl powder. It happened after he and other officers made a drug bust. The officer wiped off some powder left on his uniform with his bare hands, and within minutes, he was sick. Police think he OD'd just on the residue.