The study of hair

  • The establishment of regional origin hair
  • Gender hair
  • A study of sperm
  • Research spots of saliva, urine, sweat, and sweat discharge
  • In cases of murder, rape, accidents and in other cases at the scene, the instruments of the crime, on clothing and body of people, vehicles and other objects can be detected hair or their fragments belonging to the participants of the incident. The study allows to check the possibility of involvement took place the crime of a specific suspect or instruments of crime, and to clarify the details of the occurred incident.
    Detection of hair at the scene and physical evidence produced by inspecting them with the naked eye and with a magnifying glass.
    Detected during the inspection hair are described in the Protocol of examination of the scene and then carefully removed. Hair with each item placed in separate envelopes or packages on which to make appropriate titles. Remove hair with your fingers or tweezers with rubber or cork tips, trying not to damage and save on extraneous contamination.
    To identify the hair by a particular person - the suspect or the victim, he seized hair samples and send them to compare medical examiner. As samples are sent her hair with the frontal, parietal, temporal and occipital parts of the head (with each region taking the form of a bundle of not less than 15-20 hair, cutting off them at the base of scissors or pulling out). If necessary, hair samples can be taken and with other parts of the body - pubis, armpits and other hair Samples from each region are placed in separate packages or envelopes, on which to make appropriate titles. When hair removal from living persons should be noted, did they from the moment of the accident and until sampling haircuts, perms, coloring, bleaching or any other impacts or changes. Detection of hair on the body of the perpetrator or the victim when sexual offences and their withdrawal is made by the expert.
    When researching hair forensic expert can be solved the following questions.
    1. Are sent to objects hair?
    2. They belong to a hair of a person or an animal (establishment species hair)?
    3. With what part of the body come hair (regional origin hair)?
    4. If the data are hair loose or torn (broken)?
    5. Are there any damage or change hair - coloring, perms, discoloration?
    6. What group and gender hair?
    7. Is it possible origin of hair from a particular person? Depending on the circumstances of the accident on the resolution of the expert can be supplied and other issues.
    Membership of the investigated object to the hair is based on characteristic of their structure (morphological patterns). In hair distinguish root (part of the hair under the skin) and rod (the outer part of the hair above the skin). The root is a hair follicle, it is investigated in the case of hair torn out by the roots. More often studied the hair shaft, in which there are three layers. The outer layer of the hair (cuticle) is a laid located flat cells. Cortical layer consists of spindle-shaped cells form in the middle of the hair there is a core. The finding in the study of these three layers allows to make a conclusion that he is the hair. If necessary to resolve the issue of ownership of the object to the hair can be applied to other more specific methods of research: the study of the pattern, formed the free ends cuticle cells (which prepared the imprint of the hair on the emulsion layer fixed the film), detection of the studied object figure cuticle indicates that he is a hair; production cross sections of the object determine the cut form, the presence of the core, the location of pigment); the study of the microelement composition of hair method emission-spectral analysis.
    Having found that the received objects are hair, expert define the belonging to a person or animal, based on the characteristics of their structure (Fig. 96).
    The core of a person's hair usually looks as thin cord, or individual islets. It is a small part of the thickness of hair, the basic weight of a human hair presents cortical substance. In animals, the bulk of the hair is the core with a pronounced structure. Cortical same substance animal hair narrow, available edge cuticle cells several are separated from each other, that microscopic examination gives the impression jagged edges of the hair. Peculiarities of drawing cuticle formed by the free edges of the cuticle cells, and building core allow to distinguish the hair of animals of different species (Fig. 97).

    hair
    Fig. 96. The hair, and of a person; b - goats; in - rats.
    cuticle hair
    Fig. 97. Cuticle hair. a - Chernomorec Fox; b - Merino sheep; in - North American deer.

    Species of hair extensions can be installed using emission spectral analysis (in composition of elements).