is it illegal to count cards in las vegas
Card counting Card counting is not illegal under British law, nor is it under federal, state, or local laws in the United States provided that no external card counting device or person assists the player in counting cards. Still, casinos object to the practice, and try to prevent it,[23] banning players believed to be counters. In their pursuit to identify card counters, casinos sometimes misidentify and ban players suspected of counting cards even if they do not.[24]
Playing card The earliest dated instance of a card game involving cards with suits and numerals occurred on 17 July 1294 when "Yan Sengzhu and Zheng Pig-Dog were caught playing cards [zhi pai] and that wood blocks for printing them had been impounded, together with nine of the actual cards."[10]