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Ashley John-Baptiste is taken to a mock crime scene and learns from a crime scene expert on the importance of the role, and is shown how to preserve, examine and analyse a scene of a crime.
Blood traces hidden under paint help an expert witness overturn a miscarriage of justice, an unusual gait identifies a killer and the science of fibre evidence is explored.
Expert witnesses use fibre and DNA evidence to solve three violent cold cases in Pembrokeshire, a gemmologist exposes a diamond investment scam, and Ashley visits a toxicology lab.