Every physical contact between a criminal and a scene leaves a microscopic trace
Locard's exchange principle, the bedrock of modern forensics, dictates that every physical interaction between a criminal and a scene results in a microscopic transfer of material.
Edmond Locard, known as the 'Sherlock Holmes of France,' established the first criminal laboratory in Lyon in 1910 and formulated the rule that 'every contact leaves a trace.' This principle means that a perpetrator will inevitably bring something into the crime scene and leave with something from it, whether it be fibers, soil, or skin cells.
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