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How crime scene interference stalls major crime cases

The crime scene is one of the primary foundations of police investigations. [File, Standard]

Investigators and criminologists apply the principle ‘every contact leaves a trace’ to crack crimes while attempting to understand their patterns.

Coined by French criminologist Edmond Locard, the rule holds that the perpetrator of a crime will bring something into the crime scene and leave with something from it, and that both can be used as forensic evidence.

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