Reading the topic, I searched the internet and these are some of the responses I found from a body building forum. I do not recommend using any of these responses in real life.
Ask them this: "can I pay you some money, in return for sexual favors?" You will DEFINITELY know if they are a cop after you ask this.
Bring a box of donuts, if its a cop, she will go for the donuts first
Make her do a line of coke before offering her money for sex
Ask "are you a cop". Note: They do NOT have to answer truthfully.
For the last time.........I thought the Cop was a hooker.
Tell them you won't pay them for sex, but pay for them to get the leave afterwards.
Just pay them after sex. If you have to pay before then just feel her up so that you get something for going to jail. Remember to tip 15% even if she is a cop.
Pretend to arrest them. Then if they are a cop, they lolz and say ok im a cop too.
EOM