When you fold your cards in poker they're 'mucked' by the dealer i.e muddled in with the rest of the dead cards so you can't tell which cards came from where. T

When you fold your cards in poker they're 'mucked' by the dealer i.e muddled in with the rest of the dead cards so you can't tell which cards came from where. This is to prevent cheating and confusion in ambiguous situations. With experienced dealers and players, poker games move quite fast. It's quite normal for 5+ hands to be folded in quick succession pre-flop. Manually recording who had what cards would be really impractical. The best place to record the information without disrupting the game at all is in each of the player's hands themselves. Traditionally this is done with either under table cameras and see-through spots on the table, or RFID.