Locard was a French criminologist in the late 19th and early 20th centuries. He is best known for his formulation of Locard’s exchange principle, which states: “Every contact leaves a trace.” This principle is fundamental to forensic science, as it emphasizes that whenever two objects come into contact, there will be a transfer of material between them. This transferred material can be crucial evidence in criminal investigations.

While Locard isn’t the only person who contributed significantly to the development of forensic science, his work is considered foundational to the field.
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