It depends how much effort the police want to put into it. Again, as I mentioned in the other thread, they can simply issue a subpoena and require the SP to testify under oath, on pain of perjury. Since the SP has nothing to lose by telling the truth, and faces jail time if it's proved she lied under oath, my guess is that most SP's simply co-operate and testify that the money was for sex.
Issuing a subpoena and threatening the SP with perjury is a lot of work for the police/crown, but if they have some motivation to pursue charges, they can certainly do that.
Just a question Fuji. Lets say you go to see an agency girls and l she gets busted week later for not paying her taxes. Now if you didnt give her your real name, address,phone number etc and even if she is willing to testify that you paid her for sex how the hell are they going to track you down?By your description? What is she going to say to the cops? "Oh I saw that Fuji guy last week with a huge sausage and he paid me so he can sausage me for an hour." ''He has a birth mark on his sausage and he is about 40 and wears a mustache". How are the cops going to track you down?They would need info. Thats why its no point for the cops to force the girl to testify. Because agency girls don't have any info on the clients. Makes sense?