Treat each and every client as if they have no AW feedback and as Mirror says, screen all clients.
I take advance bookings, so for outcalls to hotels, I ask for a copy of the booking reservation. On the day the client has checked in, he had to furnish me with his room number. I will then call the hotel and ask for the client by name/room number. Alternatively sometimes, I just ask for the client to take a picture of him with his key outside the room. I take deposits for all outcalls, I find this cuts down on time wasters.
Mirror's advice re. women is good too. (I don't see women so can't comment but if I did, I would probably do similar).