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Soil analysis helps solve a 37-year-old murder investigation in Scotland; in Huddersfield, analysis of insect life on a body found on the moors helps detectives catch a killer.
A forensic scientist helps police locate new evidence to find the real killer after five men are wrongfully arrested for a crime; forensic analysis of fragments of CCTV footage blows apart a suspect's alibi.
A team of expert witnesses follow a trail of fibers and DNA to solve three cold cases in Pembrokeshire; a fraudulent diamond investment scheme is exposed by a gemologist.
A body left in a field prompts the examination of pollen, establishing a new forensic discipline; fibers fused with car wreckage prove who caused a fatal traffic collision.
Insect evidence helps crack the case of missing Warrington teenager Shafilea Ahmed; a series of convincing John Anster Fitzgerald forgeries are uncovered by an art expert.
Soil on a spade helps catch the killer of a young woman from Swindon, who for years evaded justice; a stone stuck in the sole of a shoe helps solve a murder in Manchester.