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Biological evidence means the evidence that is commonly recovered from crime scenes. Such evidences are in the form of blood, saliva, sperm, hair, tissue, bones, teeth, blood, or other bodily fluids. At a crime scene, many types of biological evidences may be present. Each type of biological evidence has a unique importance and its own probative value.
Ordinarily, biological evidence are photographed or collected from crime scene and sent to the laboratory for a DNA investigation. The DNA specific to each individual is an effective means of identification.