Looks at how law enforcers stick with cases for many years, using fresh evidence to win convictions or to free prisoners who were wrongfully jailed. We examine the unsolved murder of Hogan’s Heroes star Bob Crane, meet a Dallas criminalist who uses state-of-the-art fingerprint matching to catch a rapist and murderer, see how Phoenix police solve the murder of a missing Navajo girl 20 years later, and talk to O.J. Simpson defense attorney Barry Scheck about DNA and an Illinois rape case.