So how do card counters get caught and what happens to them?

When I was in Security at Ceasars Palace in Las Vegas we escorted them off property and tresspassed them off all Caesar's/Harrah's properties globally. If they were guests of the hotel the manager on duty essentially evicted them while we escorted them to their rooms to pack up, then escorted them off property after tresspassing them. I know, card counting isn't technically illegal, the House just doesn't like advantage players. However, anyone caught cheating with devices are immediately detained, taken to the security office, then babysat until a Las Vegas Metropolitan Police Department Officer arrives to arrest and charge them with illegal gaming devices.