"I wonder where John is?" Sandra Tucker thought, checking her watch. It was nearly 6 p.m., time for John to be home for supper. But her son never made it to the table. Driving home from his after-school job in Hartwell, Georgia, 16-year-old John had been having a little fun with a teenager in another car. "I hate to say racing, but that is what they were doing," Sandra says, when John plowed into a tree at 85 mph. "I had no idea he'd ever do anything like that." After all, John was in the National Honor Society and was listed in Who's W ....