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Blood residue
In forensic science, blood residue – wet and dry remnants of blood, as well the discoloration of surfaces on which blood has been shed – can help investigators identify weapons, reconstruct a criminal action, and link suspects to the crime. Analysis of blood residue is also an important technique in archeology.
==Forensic significance==
Blood constitutes about eight percent of a person's weight (normally about five liters), and it circulates near the surface of the skin. Almost all trauma to the body, therefore, results in the shedding of blood. Its red color makes it readily apparent at crime scenes, and its residues are very difficult to completely remove. Blood residue has even been recovered from 100,000-year-old stone tools.〔
Laboratory testing can reveal whether a substance is indeed blood, whether the blood is of animal or human origin, and the blood group to which it belongs. This allows investigators to include or exclude persons as perpetrators or victims. The antigens that allow blood group testing, however, deteriorate with age or improper storage.〔Robinson, 154.〕 The DNA contained in blood, on the other hand, is less subject to deterioration, and allows near-certain matching of blood residue to individuals with DNA profiling techniques.〔 Through bloodstain pattern analysis, information about events can also be gained from the spatial distribution of bloodstains.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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