I still wonder how they would make a solicitation beef stand from a spa bust.
Would they wait patiently in the corner of the room (under their invisibility cloak) for a conversation between the monger and the spa lady to take place?
My understanding is that a conversation must take place that specifies a sex act for a payment, and that money changes hands, wherein a police officer is one of the participants or is at least in a position to verify the foregoing.
Granted, big spa busts generally lead to pictures and names in the paper, which is a deterrent for many mongers even though a decent lawyer can later buck the charges.