Way cool! Looks like the gang beat me to answering this. But I'll a little. Ever Single Time I have ever gotten a handpay, the attendant has yanked my card out of the machine and handed it to me to insert their own card to clear the pay. Not that it matters. I have never once heard of a casino refuse to pay someone if another players card was in the machine. Even if that happened, "I dont know who's card that is, it was in there when i sat down i guess" and then what? Nothin LOL. I have had hosts ask me directly if I have anyone else in my group that plays. And then tell me "Make sure they use your card so you get the points" IE "Since I'm your host, all play on your account means more money for me."