No statute, regulation, or policy “specifically prescribe[d]” or prohibited the course of action Patty alleges the DEA agents followed.
IMO, that is the is the opposite question. What statute, regulation, or policy specifically ALLOWS that course of action. Govt was supposed to only be able to do what it was specifically allowed to do.
And apparently, "covert, undercover" means they can break the law at will with no consequences also.