Locard's exchange principle

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The Locard exchange principle, also known as Locard's theory, was postulated by 20^th century forensic scientist Edmond Locard.

Locard was the director of the very first crime laboratory in existence, located in Lyon, France. Locard's exchange principle states that "with contact between two items, there will be an exchange" (Thornton, 1997).

Essentially Locard's principle is applied to crime scenes in which the perpetrator(s) of a crime comes into contact with the scene, so he will both bring something into the scene and leave with something from the scene. Every contact leaves a trace.

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, it cannot be wholly absent. Only human failure to find it, study and understand it, can diminish its value.

- Professor Edmond Locard

Locard's principle is generally used with forensic science, every crime scene contains evidence of the perpetrator of the crime. This is because of Locard's Principle. Fragmentary evidence is any type of material left at - or taken from - a crime scene, or the result of contact between two surfaces such as shoes and the floor covering or soil.

When a crime is committed, fragmentary evidence needs to be collected from the scene. A team of specialised police technicians go to the scene of the crime and seal it off. They both video record and take photographs of the crime scene, victim (if there is one) and items of evidence. If necessary they undertake a firearms and ballistics examination. They check for shoe and tyremark impressions, examine any vehicles and check for fingerprints.

Each item found as evidence is put into a sterilised container (often a sealable plastic bag) and labelled for later analysis at the laboratory.

[edit] References

Thornton, John I. (1997), "The General Assumptions And Rationale Of Forensic Identification" in David L. Faigman, David H. Kaye, Michael J. Saks, & Joseph Sanders, ed., Modern Scientific Evidence: The Law And Science Of Expert Testimony, St. Paul: West Publishing Co.