They have the right to ask for them.
They have the right to search you for them.
They have the right to trespass warn you from the casino, permanently .
And
If the pit boss is pissed off enough they have the right to arrest you for cheating.
If they arrest you for cheating, your picture is put in the "Cheaters Books" that are circulated nationally to casinos.
It may never get that far but it can.
Harvesting roulettes might be a game to chippers but it can get nasty in certain situations.