The danger of DNA: It isn't perfect By far the most reliable forensic science, it still has limits: Samples can be contaminated and may go untested for years. And collecting it may violate privacy laws. By Maura Dolan and Jason Felch December 26, 2008 In 2004, a New Jersey prosecutor announced that DNA had solved the mystery of who killed Jane Durrua, an eighth-grader who was raped, beaten and strangled 36 years earlier. "Through DNA, we put a face to the killer of Jane Durrua, and that face belongs to Jerry Bellamy," prosecutor John Kaye said. * Full coverage: The...