Berlin police find radioactive iodine on playing cards
You can also get cheating devices [1] where the edges of all the cards are printed with IR barcodes, then a special camera (concealed in a modified phone or car key fob) can tell you upcoming cards by looking at the edge of the deck.<p>Of course, you need to convince people to play with your deck of cards first, so you can't just walk into a casino with these things.<p>[1] <a href="https://www.elie.net/blog/security/fuller-house-exposing-high-end-poker-cheating-devices" rel="nofollow">https://www.elie.net/blog/security/fuller-house-exposing-hig...</a>