Introduction

Hair evidence is generally encountered at a scene of crime which may include deposition of hair samples on a victim, suspect or nearby area. Since the inception of technique to DNA examination, hair evidence has also become an important Avant Garde to individually was used to show the opportunity of guilt, but it could not provide produce definite proof of identity. Now hair can be investigated for DNA, which can be utilized to analyze equally a victim and a criminal.

Human hair produces out of follicles situated in the skin. The part of a hair inside a follicle is the origin, the portion that is observable over the skin is called the shaft. Respectively hair is composed of three layers. The external layer, known as the cuticle, is a distinguished layer of covering scale like cells. The internal layer, the cortex, contains of extended cells that contain pigment. The cells of the medulla, the inside layer, are several sided and in rows. When component of hair is observed under a microscope, it is possible to analyze human from animal hair.

The cuticle cells of animal hairs are bigger, less regular in shape, and features of the species. The medulla is continuous and well defined, distinct human hair, in which regularly the core cannot be distinguished or is interrupted or fragmented. Medullary Index, in which the percentage of the diameter of the medulla and the diameter of the total shaft, can also be used to help differentiate between animal and human hair. For humans, medullary index is generally less than 0.33, for animals, it is usually 0.5 or greater. The best way to associate the hair samples besides under a comparison microscope. The forensic examiner can then aspect for a match between hairs in terms of color, length, diameter, nature of the medullas, and symbol of bleaching or coloring. In fact, then hair grows at a rate of around 1.3 centimeters per month (Conklin, Gardner and Shortelle, 145).