Yes criminal, I live in a state where weed is legal but due to my job I cannot under any circumstances consume THC or CBD, if so I could very easily lose my job, and a whole host of other consequences. I'm not even supposed to associate with anyone who uses cannabis anyways but unfortunately living in a college town at the moment makes that near impossible.

Plus you don't know someone's circumstances, I know people who have awful reactions to weed, plus with the quantity that OP said was in them then that is surely enough to fuck someone up, and imagine if one of the friends had something important the next day and unknowingly ate a high dose edible thinking it was a regular brownie and now cannot make it to something important. Or a friend who has a medical condition like high blood pressure or a heart issue. Weed increases both heart rate and blood pressure and could very easily cause a medical emergency in someone who took that high of a dose and has an existing condition.

It isn't heroin but it is still illegal to drug someone's food, just in this case, it would be closer to criminal negligence. They're lucky there weren't any worse consequences.