Why is The Mentalist Carl Swindler banned from casinos?

Because Carl Swindler is an expert at memorizing decks of cards, he once bet $20 at a blackjack table and won $7,400 before busting a hand. He knows when other players are bluffing in a Poker game and even has the ability to predict/manipulate their behavior. Basically, casinos are worried that he will use his skills to tilt the odds to his advantage and win large amounts of money by lowering the house edge.