Tuesday, September 8, 2009

Techniques developed to Identify Hairs/Fibers

Hair:



At a crime scene, hairs that are left may be from the head of a young white male, the fur of a lion, the head of an elderly Asian woman, or really any mammal. To identify hairs at a crime scene, the forensic scientist will take the hairs at the scene and will compare it to samples from the attacked to the arrested. At first glance under a microscope, hairs generally resemble their category such as a long blond fine hair is most likely to be head hair of a young Caucasian. Gender can be determined from hair if they have tissue samples.

Hairs vary from race, the type of hair (pubic hair), and the age of the person. The hairs can be coarse, kinky, fine, black, blond, dyed or really any of a number of traits. Hair analysis also can indicate whether or not a person has experimented with narcotics or not. Also, it displays if the hairs have been cut.


Fibers:

The possibilities for fibers are even more vast than those of hairs due to the fact many types of fibers are manufactured for different reasons. Plant fibers, animal fibers, and man-made fibers all possess unique qualities that separate each other. Due to the many types of fibers and even more types of dyes, a fiber strand may not be on only one article of clothing, but the findings will sure eliminate many possibilities the fiber strand could be.

The coarseness of the fibers also indicates what the material is. A coarser fiber is from the carpet while a finer one is from clothing. Through microscopy, forensic scientists absorb the information about the fibers and looks at the string to determine what its identity is. Scientists can easily compare evidence from the crime scene to similar fibers on the suspect. Due to recent technologies, Hair and Fiber Analysis has really been a reliable source of determining guilt or innocence.

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