Apparently this corner-store drug called "Spice" was used to target the homeless population in England, where up to 90% of the homeless were addicted to it at one point.
bbc.com/news/av/uk-england-manchester-39200637/spice-drug-making-users-like-zombies-in-manchester
aol.com/article/news/2017/03/10/video-zombies-k2-spice-drug-walking-dead/21878798/
This BBC documentary "Hidden and Homeless" touches on it - worth the hour watch:
hooktube.com/watch?v=j9HohQTwi6A
I wonder how many things like this, and bath salts, were actually released onto the public as human experiment programs.