This is vital when the crime scene may have been contaminated by pets or wild animals.
Hair is usually collected at the scene in any number of different ways. It can be vacuumed up along with other evidence and sorted out later. It can also be picked up on visual inspection. Or identified in any number of other ways. The truth is that this form of trace evidence is extremely important in helping to solve complex crimes. The more we learn about the chemical composition of the body and the physical qualities that all of us have, the more likely we will be able to catch suspects based on the trace physical evidence they leave