I was watching Hamilton's Pharmacopeia and on Season 2, Episode 4, it is claimed that Ground Glass is illegal in Arizona.
I tried to do some digging to confirm or falsify that, but the earliest mentions to anything related is from 3+ years ago, and not really well defined, talking about the amount a person would have being a subjective metric for if or not it would be considered illegal.
One of the best sources on this is actually from law.stackexchange, but again, might be outdated
Also, I think laws related to at least Marijuana have changed since then. So I would like to know if this was ever really a thing, and if it is still a thing.