>>fnbr+(OP)
It shouldn't be legal and maybe it isn't, but all schemes like this are, when you get down to it, ultimately about suppressing potential or actual evidence of serious, possibly criminal misconduct, so I don't think they are going to let the illegality get them all upset while they are having fun.
Anyway it's about not disparaging the company not about disclosing what employees do in their free time. Orgies are just parties and LSD use is hardly taboo.