how Vegas casinos wage a war on cheating

Link: http://www.huffingtonpost.com/2013/01/15/how-vegas-wages-war-on-cheating_n_2478921.html

"I think most people feel that if you can find a way to beat the
casino, more power to you," says Arnold Synder, his eyes, those
telltale features, hidden behind a pair of black sunglasses. "This
place set up the rules, they provide the equipment, they provide the
dealer, and they're basically saying, 'Come in and try to beat us.'"

It's the welcoming whisper, the allure of easy fortune. Folks come in
and wager, hoping they'll be the exception to the rule that the house
always wins. Then there are the savvier players, those who don't
simply hope, but actively seek an advantage — sometimes by any means
necessary. Probably for as long as there have been wagering games,
players have sought an edge. Depending on the orientation of your
moral compass, sometimes that search tips over into outright cheating.
And for as long as there have been cheats, the house has tried to stop
them. Today, when every smartphone is a computer, camera, and
communications device, the potential for cheating is probably greater
than it's ever been. But the casinos are fighting back with technology
of their own.