How do casinos catch card counters?Catching card counters is easy!
I've been working in casinos since 1976 and I've caught a few.
A card counter must see every card , most blackjack players look away when their hand busts, counters watch all other hands. Counting cards involves maintaining a simple + or - score. This concentration means that they can't carry on a simple conversation if you talk to them and you'd be surprised how many counters move their lips while they're counting.
Counters must count every card from the start of the shoe, but if a player is suspected of counting, it's not necessary to count from the start, just to count with the player and see if his bets increase if the count increases.