Locard's Exchange Principle is an important part of forensic science investigation. According to this theory, "Every contact leaves a trace" . No matter where a criminal goes or what a criminal does, he will leave something at the scene of the crime. At the same time, he will also take something back with him. A criminal can leave all sorts of evidence, including fingerprints, footprints, hair, skin, blood, bodily fluids, pieces of clothing and more. By coming into contact with things at a crime scene, a criminal also takes part of that scene with him, whether it's dirt, hair or any other type of trace evidence. To understand Locard’s theory it is important to understand how important trace evidence is to forensic investigation. When a crime is committed, the police and investigators are left with fragmented pieces of a puzzle. The forensic team helps in reconstructing the puzzle with the help of trace evidence which refers to evidence left behind by the criminal on ...
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