"Indeed it is "CS" gas. The container it is in resembles those carried by LEOs complete with leather case and metal clip to fasten to your belt. This one is about 8" in length, slightly bigger than current police issue."
The law is a funny thing. When I was a teenager I has a canister of CS gas go off in my pocket at Six Flags over Georgia. I didn't wear underwear back then and it got very embarrassing as I tried to get washed off and minimze the burning. The security guards laughed at me.
Today it would probably be "Georgia man arrested in chemical attack at 6 Flags."
Years ago I got it from a rambunctious LEO. Had it on my hands and took a leak later on...I can relate, but I'm sure your's was worse...