Psychoactive drugs like Spice have become a serious problem in prisons, where authorities have struggled to stem their flow and use.
The drug, tainted with rat poison, caused users to bleed out of their eyes and ears, health officials said.
A specific chemical in rat poison called brodifacoum may be tainting synthetic marijuana products.
The drug is often available where incense or marijuana paraphernalia is sold.
A substance with many names—K2, spice, synthetic marijuana—ropes in users by comparing itself to cannabis, but it's infinitely more unsafe.