Forensic Terms S2: Ep1

Trace Evidence:
Trace evidence is so small that magnification or enhancements such as alternative light spectrums or chemical treatment is needed to detect it. Clothing or carpet fibers, hair, or tiny fragments of stone, metal, glass or paint, are inevitably transferred in an exchange during a crime or a physical assault. Any action or movement in an area takes something and leaves something behind, as per Dr. Edmond Locard’s “exchange principle”- which became a standardized part of crime scene investigation in the late 1800s.