Every Contact Leaves a Trace

February 18, 2015

In forensic science, Locard’s exchange principle (sometimes simply Locard’s principle) holds that the perpetrator of a crime will bring something into the crime scene and leave with something from it, and that both can be used as forensic evidence. Dr. Edmond Locard (13 December 1877 – 4 May 1966) was a pioneer in forensic science who became known as the Sherlock Holmes of France. He formulated the basic principle of forensic science as: “Every contact leaves a trace”. (Wikipedia)