In states where gambling is legal (like Nevada), there is a huge group of regulators that do surprise inspections of the casinos. The stated purpose of this is to make sure that the casinos aren't cheating people. In reality, the system is probably corrupt. I imagine the big casinos probably pay off politicians to look the other way. Meanwhile, the smaller casinos get harassed by regulators over every little thing, even though they might not be doing anything fraudulent.

The solution to this problem is for gamblers to use blockchain platforms like Virtue Poker.