Actually the rules vary by department...
[QUOTE=TheGoodSh;1980756]I've heard that male cops have gone through with the whole session, then busted providers. This was from a provider here, who said she heard it from other providers.
I am certain it wouldn't work the other way, as I can't see a female cop taking advantage of the client or wanting to have him touch her, etc... So for the guys, it's definitely a pretty good bet that a intimate cop check would work.
But for providers, I can see male cops taking advantage of the girl, and then just acting like he didn't, and bust her.[/QUOTE]Some departments only allow the undercover to partially undress, while others leave it to the undercover's discretion.
Case in point was a county in VA a few years back where the bust usually didn't occur until the lady asked for her donation, so if it was at the end of the appointment so be it. After a local TV station did a story on the practice the department changed the policy to only allow unmarried officers to work a sting (seems the issue was that married guys were being "required" to be unfaithful to their wives).
I don't think you'll find a female undercover providing FS, but it wouldn't surprise me if I heard of one that stripped down to her thong depending on the value of the target.