Hairs and fibers are the most important evidence if found at a crime scene. The first thing you can get out of a hair sample is determining if the hair was forcibly removed or just fell out. By that you can get DNA or skin at the root of the hair and by able to identify who's hair is it. Note that the hair could also be from an animal but could be useful as well.
Fibers are also helpful to the investigation because the fiber can be traced back and the investigators can see from who it comes from. Most of the fibers come from the individuals home therefor letting it be a valuable piece of evidence.
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