Locard’s Exchange Principle | Trace Evidence | It’s Not All Black and White #2

It’s Not All Black and White #2

In the early 20th century, Dr. Edmond Locard, a forensic science pioneer in France, formulated the theory which states, “Every contact leaves a trace”. This became known as Locard’s exchange principle and is the basis for all forensic science as we know it today.

Trace evidence can be used to link people or objects to places, other people or other objects, and often serves as a starting point, or lead, for a particular line of investigation.