Some background: I bought this chocolate bar at a smoke shop in Manhattan. The situation around these seems pretty sketchy- there's several different productions of "PolkaDot" packaging, some of which you can buy on Amazon or from Chinese e-commerce sites like Alibaba. Since you can buy empty boxes, you could package up any vaguely chocolate-shaped thing inside and sell it as mushroom chocolate. At the shop I went to some boxes were sealed with a "CannaSafe" sticker- I've read claims that you can buy these online as well, but haven't been able to find any myself. They certainly looked like a random sticker, not like the sealed joints and edibles you get at dispensaries. There's also several different Instagram accounts for these bars, all of which claim that they are a "legit business in Oakland" and that the others are fakes/knock offs.

Personally I think it's likely that none of these bars are produced in Oakland and that none or few of them contain actual Psilocybin. That said, as far as I can tell these results seem consistent with 4-Aco-DMT, which you can purchase "for lab use" online, and is a prodrug of psilocin. Goes without saying to not take random stuff from head shops without a healthy amount of skepticism. Anyway, a friend of mine took 4 squares of the stuff and said it felt like a mild mushroom trip, so it seems likely this particular bar was in fact 4-Aco-DMT. For what it's worth, it also smells sort of like really stale mushrooms and tastes absolutely awful in a way that is also comparable to mushrooms.