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I think this refers to RFID-embedded playing cards, which have apparently been used at the World Series of Poker before: https://www.wsop.com/news/wsop-livestreaming-all-summer-with...

>The card information will be known to the viewers by using RFID (radio-frequency identification) technology for the very first time at the WSOP. Each card has a microchip embedded in it that has no impact on the cards or play, but with a specially-outfitted poker table, can send an encrypted signal to decipher the card’s rank and suit. The WSOP has used this technology during the 2012-13 WSOP Circuit season with success, and it is found throughout European poker events as well.



Update next day, I can't believe it was X-rays... https://news.ycombinator.com/item?id=45693599




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