In Asian casinos, card switching is a serious problem – cheaters bring specially-marked cards from home and replace them over the course of several games through sleight of hand. Many casinos are now using a system called the Angel Eye to stop it before it starts. The device is a customized baccarat dealing shoe that reads invisible ink printed on the backs of the cards before they’re dealt. It then records the deal and shows the dealer – meaning that if a player pulls a switch, it won’t match up with what the Angel Eye recorded and the cheater will be caught instantly. Pretty clever stuff.
Photo credit: Angel Playing Cards