At most restaurants, when the time comes to pay the check, you hand over your credit card and a waiter you’ve known for only about an hour takes off with your credit card. You trust that the waiter will only charge your meal and won’t make off with your card number. But if you ever have been to a Legal Sea Foods restaurant, you will notice that the waiter brings a handheld electronic device to your table to swipe your credit card when you are ready to pay the bill. … More