What is forensic 'physical evidence'?

What is forensic 'physical evidence'?

Richard Saferstein (Former Chief Forensic Scientist) gives expert video advice on: What is forensic science?; What is forensic 'physical evidence'?; What is forensic 'identification' of physical evidence? and more...

Physical evidence is any object that could link a suspect to a crime scene, a victim to a crime scene, or it can tell us something about whether a crime has taken place or not. Now, what is an object? That in itself is pretty interesting. An object can be anything such as a gun or it can be a bullet, but it also can be something as small as a human cell, because with current technology we can extract information from a single cell that can tell us something about the DNA type of an individual that was present at the crime scene. So I use the term 'object' very loosely. It can be anything from the large to the infinitely small.