To do this with a group of reagents NONE of which were toxic, would be a major coup.
True. Yet it could be possible to have dry chemicals, agents in small lotion or shampoo bottles, "aftershave", and whatnot. Not to go into extreme detail, but there are many ways to transport reagents and, shall we say, other seemingly harmless things. I guarantee that there was an incident. Probably in a lav.