This method requires the cooperation of the card dealer in the casino. The card dealer falsely shuffles the card leaving some unchanged. This allows his partner to become aware of the cards that were not shuffled.
Switching of Card
Switching of cards is a popular scam and has been very popular for some time. It has now been modified from a simple hand trick to a complicated scam making use of hidden devices. Scammers use this device to hold the card in their sleeve and switch it with another card.