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Trace Evidence: Hair

Trace evidence any very small physical material that can be transferred from person to person or between a person and a crime scene. Ex. hair, fibers, pieces of glass, chips of paint, dirt.
Why are hairs trace evidence? the hair itself contains many toxins (like arsenic) and you can extract DNA from the follicle.
Cortex the largest portion of the shaft giving you the hair color that you have, the interior of the hair
Cuticle the layer of cells that cover the surface of the shaft and looks like scales on a fish or even roofing tiles. Outside covering of the hair.
Medulla is a collection of cells which appear as a canal running though the center of the hair
Medullary index the width of the medulla relative to the overall width of the hair
Hair Follicle Hair is an appendage of the skin that grows out of a structure known as the
Hair Root The part of the hair that is embedded in the hair follicle.
Hair Shaft is composed of the cuticle, cortex, and medulla and is subjected to the most intense examination by the forensic scientist.
Upon finding hair at a crime scene, the first thing to be done is an examination in a crime laboratory to establish whether the hair originates from a human or animal
Created by: TBrylewski