Card counters, the gig is up. Researchers created a system of cameras and computers that can sniff you out within 20 hands. The system measures patterns in the card game of Blackjack, detecting if a player is betting more when the cards remaining in the deck are favorable. Then it can notify casino authorities so they can dispatch Billy Badass bouncer to toss you out on your ear.
Never mind that card counting is actually legal.
The system's still in the research stage thus far, but you can expect Las Vegas casinos to pick up on this in a New York, New York minute. That is, if they haven't already. After all, why would Las Vegas casinos want to give anyone a fighting chance at actually winning?