
Eagle-eyed technical experts prove there is no such thing as a perfect crime as they assemble the pieces every criminal leaves behind. Dramatic crime re-creations and, sometimes, part of the investigations are a staple of the series. Some of the re-creations include alternate versions of the crimes, which are disproved by science. The show's episodes follow each case from the initial investigation until it reaches its legal resolution.
Police are able to create a composite sketch of a man burnt beyond recognition. But tracking the killer is more challenging.
By cutting a strand of a murdered man's hair into sections, forensics reveal a record of his last six months alive, and find he was frequently ingesting huge amounts of arsenic.
A bullet-riddled car, a missing driver, and no witnesses, an ambush or a random attack; the clue was something so tiny, it was measured in millionths of a meter.
Teenager is found half-naked with her throat slit; a single foreign hair found on her thumb may finger the killer.