This is my post in other thread but I think it's better to have it in a new title (with minor edit) to alert people who think he/she can get away with no ID or player card.
Here is what happened to me. I came to a casino to check out their blackjack condition as a friend told me they changed the rules and pen for the better. This was 2nd time I ever there and I never get player card from them as I never play anything there because of their lousy rules/pen. I sat down to play few hands of UTH to kill boring time and the floor asked for player card, I said I do not have one then she nagged me for ID but I said NO and gave the reason as this place is too far for me. She disappeared for about few minutes and another floor came to the table also asked me for player card, he got the same answer from me but he smiles and said "Good luck Mr. X" I almost fell off the chair as how could he knows my name. On the way drive home it occurred to me that may be they rewind the tape, trace my steps and read my license plate and that is only way.