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Examination And Collection Of Blood Evidence

980 words - 4 pages

Examination and Collection of Blood Evidence Outline 05/11/2014Blood evidence linked to a crime can offer information that can solve the case. It is critical to properly document, collect, examine, and preserve this kind of evidence. There are many different tests associated with blood evidence that can result in a multitude of results and information on the crime. Blood evidence that is correctly collected and preserved can create a solid connection between a suspect and a crime.The best way to determine if an unknown substance is blood is to use the preliminary color test. If the Kastle-Meyer color test produces a positive result, it is most likely blood. The luminol and Bluestar tests are used to find trace amounts of blood situated at crime scenes (Saferstein). Every red blood cell contains either an A, B, both A and B, or no antigens. The type of antigen that is present on a person's red blood cells determines their blood type. People with type A blood have A antigens on their red blood cells, and people with type B blood have B antigens, those with type AB blood have both A and B antigens, and those with type O blood have no antigens on their red blood cells. This information can help with a criminal case because, for example, if type AB blood is linked to the suspect, anyone who has a type B, A, or O blood can be excluded from consideration (Saferstein).. Crimes that have violent interaction between individuals are often accompanied by bleeding and subsequent bloodstain patterns. A lot of information can be uncovered by the result of a bloodstain pattern (Saferstein). "The direction from which blood originated, angle at which a blood droplet struck a surface, location or position of a victim at the time a bloody wound was inflicted, movement of a bleeding individual at the crime scene, minimum number of blows that struck a bleeding victim, approximate location of an individual delivering blows that produced a bloodstain pattern" (Saferstein, 231).After the crime scene has been carefully documented and the sites of the evidence are noted, the collection process can start. The collection process will typically begin with the most delicate or most easily lost evidence. Any evidence that need to be moved should also call for special attention. If the investigator finds more evidence that was not previously documented, more photographs should be taken (Schiro).If blood at the crime scene is found in liquid pools, then it should be collected with a gauze pad, sterile swab, or threads that are slightly moistened with sterile distilled water (Andrus). It should be made to concentrate the stain in a localized portion of the swab or pad (Nfstc). After allowing it to air dry completely at room temperature, it should be refrigerated or frozen immediately and be brought to the laboratory as soon as possible. If the blood sample is not completely dry, place in a brown paper bag and seal and label the container. Delays that exceed two days could...

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