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In recent times, science has provided substantial aid to crime detection. Because anything in the physical universe has the potential of becoming an item of evidence in an investigation, a wide variety of procedures may be used in analyzing and interpreting evidence in a criminal case. These procedures include handwriting analysis, forensic photography, crime scene documentation, metallurgical investigations, chain of custody, entomology, and blood spatters. The first thing you do after securing a crime scene …

…off stains is a result of blunt force trauma (beating with an object such as a hammer). Pulling back from a blow produces a blood spatter that indicates direction, by creating an arc of blood droplets. You can determine the number of blows inflicted by counting the arcs. You can also determine the orientation of the individuals involved the size of the object used and the right or left handedness of the assailant. Bibliography encyclopedia