The car was the key. on the boy's clothing was a small bit of paint ,probably from the car that hit him. Scientific analysis showed that the paint might have come from a certain model of car , a Chrysler coronet. The pollice examined hundreds of coronets, but the paint from the crime scene didn't match any of them. Finally , officers found an old car witch paint he matched perfectly. Government record showed who had owned the car, and the police caugth the guilty driver.