Narin Leininger knows about the risks of talking on a cellphone or sending text messages while driving. The 16-year-old high school junior says he'd only use his phone behind the wheel in an emergency — a flat tire, traffic jam or crash.
But if he ever decided to whip out his phone to chat or text with a friend while steering, he wondered, could anyone stop him? "There's no way a cop could see if you're texting under the steering wheel," said Leininger, a student at San Francisco's Lowell High School.