Casinos shuffle decks in Blackjack using a variety of methods to ensure fairness and prevent card counting. In traditional games, dealers manually shuffle multiple decks by performing riffle and overhand shuffles, sometimes allowing players to cut the deck. To speed up the process and increase randomness, many casinos use automatic shuffling machines, which shuffle several decks at once and prepare the cards for the next round quickly. Some casinos also use continuous shuffling machines (CSMs), which continuously shuffle cards during play, making it more difficult for players to track card sequences. In high-security settings, the cards may be shuffled after every hand to maintain fairness and integrity. These methods help prevent manipulation and ensure the game remains unpredictable for all players.