Locard's exchange principle

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).

"'Edmund Locard built the first forensic laboratory in 1910 in France. He was reportedly influenced by the Sherlock Holmes stories written in the 1880's by Sir Arthur Conan Doyle."' hi

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.

cquote|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.
4=Professor Edmond LocardFragmentary or trace 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, or fibers from where someone sat on an upholstered chair.

When a crime is committed, fragmentary (or trace) evidence needs to be collected from the scene. A team of specialized police technicians go to the scene of the crime and seal it off. They both record video 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 tiremark impressions, examine any vehicles and check for fingerprints.

Each item found as evidence is put into a sterilized container (contrary to popular belief, this is almost never a plastic bag, but actually a paper bag or envelope, which will prevent further decomposition of evidence) and labeled for later analysis at the laboratory.

An easier way to remember this is that "Every Contact Leaves a trace."

References

* Harvard reference
Surname=Thornton
Given=John I.
Year=1997
Chapter=The General Assumptions And Rationale Of Forensic Identification
Editor=David L. Faigman, David H. Kaye, Michael J. Saks, & Joseph Sanders
Title=Modern Scientific Evidence: The Law And Science Of Expert Testimony
Volume=2
Publisher=West Publishing Co.
Place=St. Paul

External links

* [http://www.profiling.org/journal/vol1_no1/jbp_ed_january2000_1-1.html Evidence Dynamics: Locard's Exchange Principle & Crime Reconstruction, W. J. Chisum, B. E. Turvey]