Crime scenes can contain any number of categories of evidence. Most laypeople think of firearms, blood, shattered doors, and bodies. The fact is that anything physical can become evidence if it were used, stolen, or placed at a crime scene. When you look at evidence, many times it is what you dont see that is important.

Identify 3 types of evidence that you typically are unable to see until they are processed.
Identify how these types of evidence are critical in determining the facts concerning the crime scene that help identify what happened and who was involved in the scene at the time of the offense(s).