Hello ladies and gentlemen, my name is Sandy Doan. I am a hair analysis expert. I work in the lab of California’s Police Department. I work using the Scanning Electron Microscope, also known as SEM, for analyzing different types of small evidence. I have been spent 8 years on this job which why I am wearing glasses due to the constant straining over the years. However, today I am here to determine whether or not the three suspects are responsible for the murder that has been committed. Using the lab results about the hairs, I am going to explain how to find the suspect with the hair analysis that we have collected.
In order for the hair samples to be convincing evidence to catch a criminal, the evidence has to make sense. Knowing the different parts of the hair and their functions greatly helps in this. The root of the hair has a particular structure. It is made of the follicle which is the tube like depression or pocket in the skin or scalp that contains the hair root, the hair bulb which is the lowest area or part of the hair
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Medulla patterns are often not very helpful in forensics for a few reasons. The patterns can often differ from hair to hair; some hairs will have it while others won’t. This is because the medulla only shows in coarse hair while fine, blond hair do not have a medulla. Because of this it often is used in forensics. The cortex of the hair is located between the medulla and the hair cuticle. It is the thickest part of the hair. It contains most of the hair pigment, giving it its color. This is often in finding out what color of hair the suspect or criminal had. The final part of the hair is the outermost part, known as the cuticle. It is a hard shingle like cover that is the first line of defense against any damage to the hair. It does not provide the pigment of the hair. It protects the other two layers of the