forensic science - gsr trace
When an officer arrives at the location of an alleged shooting, after first rendering aid to the victim, he or she begins to search for evidence. Much of this effort consists of searching for the bullet, the gun, shell casings, and witness testimony; however, when the shooter leaves the scene, he/she takes with them a substantial part of the evidence that can significantly improve the prosecution's case. This evidence can be found on the hands, body and clothing of the shooter. Much of this evidence may be invisible to the naked eye, yet is still valuable for the prosecution's case. This evidence includes micro blood splatter, trace metal evidence, gunpowder residue, and even the gun. The first step when a suspect is apprehended in a shooting is to frisk the suspect for the weapon. While this will display that the suspect has a gun after the approach, it does not assist in the safety of the officer beforehand, nor assist in screening large quantities of people. Being caught with the proverbial smoking gun can be damning evidence in court, but typically at a crime scene, many onlookers gather making the frisking of each individual at the scene or leaving the scene an impossibility. In 1995, the Justice department fund
Sometimes these tests can carry tremendous credence and credibility depending on the make of the gun. Techniques of Crime Scene Investigation. However, a significant amount of evidence is carried away on the shooter, thus necessitating the rapid capture of the alleged because most this evidence can be destroyed, disturbed or eliminated while the scene is being secured or analyzed. 5 million study for the development of a hand held device that would enable the officer to scan individuals at the crime scene for concealed weapons. Cincinnati: Writers Digest Books, (1992). Techniques of Crime Scene Investigation. The limitations of the gas chromatography are that it can only compare the known samples of gunshot residue to the residue found on the hand. 8 The alternative method for the collection of gunshot residue involves small aluminum discs with double-sided cellophane tape, which are pressed into the webbed portions of the hand.
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