“By all appearances, this was just another fatal heroin overdose — something that happens more than once an hour in a country awash in opioids. But it wasn’t heroin that killed DJ. It was fentanyl, an opioid manufactured in hidden laboratories to be up to 100 times more powerful than heroin.” From Stat: Dope Sick: A harrowing story of best friends, addiction — and a stealth killer.