Most people are introduced to forensic science through TV and film, and because of this we have come to see forensic techniques such as ballistics, footprint analysis, and bite mark identification as foolproof methods for solving crimes. But many forensic science techniques were not developed by scientists. They were developed in crime labs by law enforcement professionals who needed methods for testing available evidence. These techniques were often subjective, and not run through the same kind of rigorous testing of traditional science.