A synthetic white powder called monkey dust is a big problem in one UK city. But lurid headlines about glass-eating zombies hide a much more shocking story of government neglect.
In some parts of the world they conjure wild memories from the 2010s. In Russia, they're more popular than weed.
The DEA has moved to outlaw 10 chemicals commonly found in the cheap designer drug, but manufacturers will likely respond by tweaking their recipes.