Abstract

FORERO PAREDES, Jorge Gerardo et al. The Influence of Contaminants in a Shotgun Barrel on the Results of a Griess test (a and b) for Detecting Gunshot Residues. Rev. Crim. [online]. 2021, vol.63, n.1, pp.61-76.  Epub May 19, 2021. ISSN 1794-3108.

This study's general objective was to determine the degree of impact a GRIESS test (a and b) may have on the inside of a Benelli Supernova shotgun barrel by transmitting contaminants, such as oil, rain water, diesel and gasoline. The need arose to research whether or not the established contaminants can affect performing the procedure described in clause 4.1 of guide 2DC-GU-0024 on "performing ballistic testing on weapons (firearms, pneumatic, gas, black powder, detonating, electrical, etc.) and entering ballistic identification systems." The methodology was experimental. A high number of tests were carried out, manipulating components A and B of the GRIESS reagent. As a result, it was observed that contaminating agents transferred within a barrel (4-stroke engine oil, diesel and gasoline) do not affect the results of identifying nitrates resulting from combustion during firearm discharge. The opposite occurs with rain water, since it was observed that is affects preparing evidence, taking into account that it yields a light pink coloration as a result without coming into contact with combusted gunpowder, which preliminarily indicates that it tested positive for the presence of nitrites.

Keywords : Ruling; evidence; expert; firearm (source: Latin American Criminal Policy Thesaurus - ILANUD). GRIESS test (source: author).

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