The tangent to this is done with invisible ink. https://www.markedcardsshop.com/... | Hacker News

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		shagie on June 29, 2022 \| parent \| context \| favorite \| on: The Nettle Magic Project: Scanner for decks of car... The tangent to this is done with invisible ink. https://www.markedcardsshop.com/collections/poker-analyzer There is a corresponding custom phone that has a hidden camera on the side (facing the deck) that then communicates with some haptic feedback that the cheater is wearing.

raphman on June 29, 2022 [–]

Here's an article from 2017 talking about this class of devices:

https://elie.net/blog/security/fuller-house-exposing-high-en...

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