Rainman was about Las Vegas, NV, and more specifically, the Strip. Rest assured that there is someone the pit can call to watch and analyze your play in that location. They have many duties, not the least among them, to surveil employees for cheating. And if there is a larger "threat" occurring in a casino that is entertaining thousands, your play will not get a notice until the pit makes a call. How many screens, I don't know. My small hotel where I stayed had 28 screens; I know because security invited me in to see. It was just a hotel, with no other security issue than the safety of its residents. Imagine the far greater needs of a casino.