Crime scene forensics: How does it work?
Forensic evidence and the way it was gathered came under close scrutiny in the trial of Stephen Lawrence's killers.
Techniques and practices have developed significantly since 1993 and are now a key part of police investigations from the start.
The basic principle is "every contact leaves a trace" and specks of blood, fibres or fingerprints become silent witnesses against the criminal. Here, we examine forensic science from crime scene to courtroom.
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