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How detective David Baker became the first person to use DNA profiling in a criminal investigation, when looking for the killer of two young girls in 1986.
After a badly decomposed body is found in a suitcase by a railway embankment in Exeter, police hunt for the killer with only CCTV evidence to go on.
How the investigation into Phillip Inhofer at his home in Sacremento led police to a 20-year-old call girl known as Bat Girl.