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 funde
The second form of microscopic evidence is the gun powder residue test which used to be done by coating the suspect's hands in paraffin and sending the paraffin off to the crime lab7. : CRC, (2000): 2853 "Gunshot Residue Testing" Web page, May 16, 2001 found athttp://www. com: Encyclopedia Britannica Online. Cincinnati: Writers Digest Books, (1992). The first are trace metals, the second is gunpowder residue. The final pieces of macroscopic evidence visible on the suspect are injuries incurred on the suspect resulting from misuse of the firearm. 6 More commonly this test is used as a means of connecting the alleged firearm to the alleged victim.
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