I was sitting with my wife at a slot machine at a casino in the NW suburb of Phoenix when we hit a big win. It didn't require a W-2G or anything, but it made me start to think. We were sitting together with her player's card in the machine, but it was "my turn to play," so I hit the button. If we had won a really large amount, could they have denied it or voided it if they went back and looked at the cameras and saw that it wasn't my wife that was playing? Can a person win a jackpot with another person's card in the machine? Would the casino have paid me, since I was sitting at the machine, or pay my wife because it's her card that's in the machine?