Fuck me, carfentanil is one of those things I read about years ago, that seemed like it would never get anywhere near the recreational drug market, because it’s just too potent and too dangerous to handle safely…

Ah, I see from your link it was u-47700 he was arrested with. Certainly a potent and potentially lethal substance, but not exactly on the same scale as carfentanil. U-47700 is quoted as 7.5x the potency of morphine, fentanyl at 50-100x and carfentanil around 4000