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Edmond Locard
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<p>Dr. Edmond Locard (13 December 1877 – 4 May 1966) was a French criminologist, the pioneer in <a href="/facts/Forensic_science/4upVa2vB">forensic science</a> who became known as the "<a href="/facts/Sherlock_Holmes/fhN0w3Jv">Sherlock Holmes</a> of <a href="/facts/France/CxIeIKM3">France</a>". He formulated the basic principle of forensic science: "Every contact leaves a <a href="/facts/Trace_evidence/G0vtRL6n">trace</a>". This became known as <a href="/facts/Locard%2527s_exchange_principle/ggzhbDIl">Locard's exchange principle</a>. </p>