On the second day of her dream vacation on exclusive Bald Head Island, Julie Mall went with her family to the beach to catch the sunset. Her 11-year-old son asked to drive the golf cart back to their $1,000-a-day rented cottage. It was dusk, no traffic on the path and his father would sit next to him. A two-block, 30-second ride. She said sure. What could go wrong? In the next four hours, Mall says she was pinned to the ground by police, repeatedly accused of being drunk, frogmarched barefoot aboard a ferry in handcuffs, jailed in leg irons and...