Forensic Files S05 E01 Badge of Deceit

"No Witnesses. No Leads. No Problem."

For more than a decade, women in a small Louisiana city lived in fear of a serial rapist. Fortunately, computer technology and behavioral science combined to give police a new forensic tool: geographical profiling. Police narrow their search to one man, but to prove he’s the perpetrator they turn to an unlikely piece of evidence--- a discarded cigarette butt.