blackjackDundee student Kris Zutis has invented, with the help of his supervisor, a program that catches players who count cards at Blackjack tables. Essentially, the program does it’s own counting, and then checks if a player’s bets are in line with what a counter would do. Or something like that.

Mentally counting cards is not illegal, but casinos don’t like it because it doesn’t allow them to keep house advantage – which is really a stupid position to hold, when you think about it; simply don’t offer the  game if you don’t like people playing it.

(source)