Casinos counter card counters by closely monitoring player behavior, especially betting patterns, using surveillance cameras and tracking systems. To disrupt card counting, they may shuffle the deck more frequently, use multiple decks, or alter dealer procedures. Additionally, they might monitor player activity through loyalty programs, where unusual betting behavior can raise suspicion. If a player is suspected of counting cards, casinos may ask them to leave or ban them from Blackjack tables altogether, even without directly accusing them of cheating. The overall goal is to make it difficult for counters to gain an advantage through strategy.