In addition to new episodes of Crimes of Passion each week, you’ll now also hear Crime Bites every Friday. Each Crime Bites episode gives you a deeper, yet brief look into true-crime topics covered at Parcast.

Today we’re discussing the clues that criminals left behind and the ways in which the police used them to hunt down their suspect. These clues could be biological, such as DNA or fingerprints; or physical, such as a piece of clothing fiber left at the scene. Some were merely overlooked by the criminal—and some were intentionally left behind.

Clips featured: Serial Killers: BTK Pt. 2, Unexplained Mysteries: Zodiac Killer Pt. 1, Espionage: Aldrich Ames Pt. 2