Over 30 marked decks were confiscated by police when a man claimed he got cheated from a poker game in China. The idea of cheating in a card game using contact lenses is not new as portrayed in the Chinese film "God of Gamblers."
This idea is exactly what four Chinese cheaters pulled off in a poker game wherein they used special contact lenses to dupe an unsuspecting player. Chinese authorities have apprehended the alleged scammers who have been accused of using marked cards and special contact lenses to cheat more than $10,000 from their victim in a poker game.
The game was held in a hotel in Dali City, China. The suspects lured the complainant, identified only as Feng, on the pretense of assisting him in finding clients for his pesticide company. The five played poker wherein the four allegedly conspired to cheat their victim.
Round after round, the group managed to outplay Feng. By the time the victim decided to quit the game, he had already lost a significant amount of money. It was only after leaving the game that Feng suspected he was cheated.
Feng filed a complaint with the local police who enacted the investigation. Evidently, the suspects failed to abandon the scene as authorities found them in that very same room.
The police found 30 decks of marked cards along with special contact lenses that allowed the wearer of the lenses to identify cards the victim was holding, which he then signaled to his fellow cheats.
Source: http://calvinayre.com/2016/10/04/poker/chinese-poker-infrared-contact-lens-scam/