Gunshot residue
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Gunshot residue, or more technically, gunshot primer residue, is expelled as tiny particles from the barrel of a firearm when it is fired. Among other materials, gunshot residue contains the heavy metals barium, lead and antimony. Modern forensic methods require the presence of these metals to identify trace evidence as gunshot residue.
Through the 1990s the presence of two or more of these heavy elements was sufficient to conclude the chemicals were the result of a gunshot. New, more rigorous standards for gunshot residue testing are now being required by many courts. The trend is toward a standard that requires the presence of at least one Pb-Ba-Sb particle (lead-barium-antimony) exhibiting characteristic GSR morphology and supported by a sufficient number of atomically identified GSR supporting particles in the remaining particle population.
Investigators may test a suspect's hands, arms and face for particles of gunshot residue as evidence of having recently handled or fired a gun.
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The c.s.i is currently trying to make classes for outside people. re-up[[Media:www.jamglue.com ]] they think that people should be able to look at the residue and solve
