Marked cards are one of the most common ways for cheaters gain an advantage in gambling games. They can be used to perform magic card tricks. In order to cheat with marked playing cards, it is necessary to have a certain amount of skill. While many casinos have taken measures to prevent card marking, some are still finding ways to beat the system.

Traditionally, markers would crimp or bend the corner of a card. This made it easier to read the cards, but the gambler’s test could still detect this. In recent times, players are using luminous or liquid methods to mark cards. These methods are less visible, but more difficult to use regularly.

In his breakout session at the WGPC Learning Labs, Blazevic warned that card marking is not only a serious threat, but it is becoming more common in casinos and other gaming facilities. He noted that card marking used to be considered an art, and cheaters spent time and money on developing their skills. Now, you can easily find websites that sell daubs or reading lenses. There are also many different ways to mark your cards.

Casinos can scan cards with a special reader to detect marked cards. These devices can detect if there are any marks or alterations and report them to the staff. Casino employees can also spot suspicious players if they look for unusual play patterns. Casinos may suspect cheating if, for example, a player is consistently winning and not playing with any other players.

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