Explore the fascinating, and sometimes gory, world of forensics, where science helps crack the case. How do you know if a red stain is blood or ketchup, or whose blood it is? Can computers really recognize your face in a crowd? Why are fingerprints so important in an investigation? Learn why it is critical to quickly secure a crime scene, and how DNA sampling works. Find out how maggots can reveal how long someone has been dead, or how a single fabric fibre can lead to the murderer.