“Wherever he steps, whatever he touches, whatever he leaves, even unconsciously, will serve as a silent witness against him. Not only his fingerprints or his footprints, but his hair, the fibers from his clothes, the glass he breaks, the tool mark he leaves, the paint he scratches, the blood or semen he deposits or collects. All of these and more bear mute witness against him. This is evidence that does not forget. It is not confused by the excitement of the moment. It is not absent because human witnesses are. It is factual evidence. Physical evidence cannot be wrong, it cannot perjure itself, and it cannot be wholly absent. Only human failure to find it, study and understand it can diminish its value.”
Edmund Locard is well known for his famous principle, “Every contact leaves a trace.” Locard’s exchange principle is also referred to as Locard’s Theory which was established in 1904. Six years after Locard’s theory was established, he became the director of the first crime laboratory in existence in
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