Every contact leaves a trace. The importance of Locard's Exchange Principle.

We have all watched TV forensic pathologists pause whilst photographing the body, grab a pair of tweezers and bag a piece of trace evidence from under the victim’s fingernails or inside a wound. In the storyline, this fibre or sliver of glass proves to be crucial damning evidence against the killer. So how important is trace evidence and is it true every contact leaves a trace?

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