본문 바로가기

Digital Forensics/Forensics Generalization

로카르의 교환법칙

From Wikipedia, the free encyclopedia

Jump to: navigation, search

The Locard exchange principle, also known as Locard's theory, was postulated by 20th 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 the perpetrator(s) 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.

—Dr. Edmond Locard

Fragmentary 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 tire mark impressions, examine any vehicles and check for fingerprints.

An easier way to remember this is that "Every Contact Leaves A Trace."

----------------------------------------------------------------
모든 접촉은 흔적을 남긴다.

포렌식의 격언인 로카르의 교환법칙

디지털도 마찬가지다

모든 접근, 행위, 행동은 흔적을 남긴다.