It was nearly 11 on a balmy June night in Muttontown, a New York City suburb. Two teenagers raced fast cars down a tree-lined thoroughfare. The 19-year-old, home from freshman year at Tulane University, steered a new Mercedes with a license plate that read 4MRNICE. The 17-year-old, a high school junior, accelerated a two-year-old Corvette. At an intersection, within a second of each other, both cars smashed into a red Jeep, killing a nurse and her fiancé. At the hospital, one of the youths told a detective they were driving 50 m.p.h. to 55 m.p.h.

But unbeknownst to the teens and their families, there was a hidden witness to the race. A palm-size microcomputer, embedded in the Corvette's air-bag system, revealed that the car was traveling 139 m.p.h. The data, downloaded by police after the vehicle was impounded, convinced a grand jury to indict the youths on murder charges, based on "depraved indifference to human life." In the end, they pleaded guilty to manslaughter and assault, and are now serving a three-year prison term. "The minute the prosecutors had the speed from the 'black box,' they upped the charges to murder," says Richard Slade, whose son Blake was driving the Mercedes. "They had what they needed to force a plea down our throats."

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