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Forensic medical examination of blood stains

Specialist in forensic medicine helps the investigating authorities in the identification of objects similar to the traces of blood, their right of withdrawal and direction for examination. On white and light objects blood distinctive and are red, brown or brown color. Darker objects blood spots may appear lighter than the surrounding background. These spots and stains, the color of which is close to the color of the subject of carrier detected in daylight or in oblique incident light. In some cases, the detection of traces of blood hampered by changing its color due to significant remoteness of education spots or rotting. Blood spots in this sense brown, brown, brown or greenish. The same applies to washed the blood stains that may have yellowish or yellowish-pink color.
To detect traces of blood is also used lighting objects ultraviolet rays. Blood spots when viewed them in ultraviolet rays (for this purpose you can use a quartz lamp or ultraviolet light) have dark brown color and smooth appearance, with large ago their education they glow orange-red. Such research can only be suspected the presence of blood in the spot, because the sample is not specific.
As evidenced by the investigatory practice, the offender is unable to destroy all traces of blood at the scene. Traces of small size or in hidden places (in the cracks of the floor, under the skirting boards and others) often remain, and they can be found. When viewed furniture special attention is paid to the connections of parts of furniture, various cracks and hollows. If you suspect the dismemberment of the corpse carefully examine the pots, buckets, basins, toilets, baths and other such items. In road accidents mandatory inspection of vehicles (wheels, lights, bumpers, fenders and other). When searching for traces of blood on the instruments of the crime - knives, axes and others with the help of a magnifying glass carefully examine not only the surface, but other types of cracks, cavities, the joints of parts of these items. Disassemble and inspect the inner surface of the sheath. Garments examined both outside and from the inside. Pay attention to seams, pockets, cuffs, loops, buttons. Shoes visiting the top and from the bottom. During the inspection of the suspect can detect traces of blood under the nail plates, in the genital area, etc. as soon after the incident will be made inspection, the easier and more can be found traces of blood.
Traces of blood examine the naked eye and with a magnifying glass, and then carefully describe in a certain sequence in the report. Indicate the location of the track, its shape, size, color, characteristic contour edges, surfaces, overlays, number of tracks, marked the presence of spots on the surface of the dried crusts and other features of the track. When specifying the location of the blood stains on clothing, footwear or other articles, it is recommended to use the schemes. With traces of blood during the inspection must be handled carefully. Subjects with blood should be taken by hand only for the area free from blood, and otherwise using existing traces of blood can be included extraneous contamination or sweat the examining.
Identified and described traces of blood is taken and sent for analysis. Small objects with traces of blood is taken and sent for examination wholly - articles of apparel, shoes, axes, knives, etc. At the location of the spots on the bulky items to be seized part of the subject with traces of blood and part without traces for control studies. With the objects of artistic value, blood spots have seized by gently scraping or flush on the gauze soaked in physiological solution or distilled water. Together with flush as control sample for the study goes a clean gauze. When the blood stains on the walls and plaster them usually seized by cutting a piece of plaster, containing mandatory and clean, not stained with the blood of areas. In exceptional cases spot scratch out with the least possible admixture of the plaster, and near the spot with a wall surface scratch out a part of plaster to control. Received scrapings wrapped in white paper.