Badge of Deceit (S05E01)

The search for a serial rapist who preyed on the women of Lafayette, La., from the early 1980s through 1995 is detailed. Despite using the most advanced methods available to them, the investigators came up empty until an anonymous phone call tipped them to a suspect: sheriff's deputy Randy Comeaux. DNA evidence taken from a cigarette butt confirmed that he was their man. (TruTV)