12/15. Detectives hunting the killer of a young woman from Bolton require the help of a fibre and DNA specialist to arrest their suspect. Also in HD. [S,SL]
10/15. When a teenager's body is located in a shallow grave, a soil specialist is called on to unearth evidence to convict the killer. Also in HD. [S,SL]
7/15. An expert witness helps police link a drug gang to the death of a Vietnamese man in Wales. And DNA experts gather evidence that identifies the killer of a man from Bristol. Also in HD. [S,SL]
4/15. When a woman is the victim of an acid attack in Brighton, an expert pieces together hours of CCTV footage to identify the suspect. Also in HD. [S,SL]
3/15. When a 21-year-old student is murdered and dumped in the Humber Estuary, a forensic biologist helps police bring her killer to justice. Also in HD. [S,SL]
10/15. Pollen and bone experts help identify the remains of a murder victim found in a sports bag. And advances in DNA help find the killer of a Bradford pensioner after 22 years. Also in HD. [S,SL]