Rafae, Azie Azyanti Mohd
(2016)
Study of the persistence of gunshot
residue (gsr) on gloves using colour test.
Project Report.
Universiti Sains Malaysia.
(Submitted)
Abstract
During the discharge of a firearm, gunshot residues (GSR) escape from the openings in
the firearm including barrel end, ejection ports, space between the barrel and cartridge
holder in revolvers, and deposit on surfaces in the vicinity of discharging firearm.
Detection and identification of these GSR particles could provide valuable information
in forensic investigations especially for the determination of a shooter. In cases where
criminals wearing gloves and GSR were not found on their hands, rapid colour test such
as Modified Griess Test (MGT) can be used for an early screening of GSR on the
recovered gloves. This research aims to study the persistence of GSR upon different
materials of gloves using MGT. During firing test, two different weapons were used,
namely Walther*’ P99 semi-auto pistol and .38 revolver, with four different types of
gloves worn by the shooters. The results of this study showed that cotton with PVC
dotted hand gloves and knitted cotton gloves gave significant results upon MGT with
die detection of nitrite compounds. GSRs were more likely to be deposited on die
surface of gloves when fired with revolver compared to the semi-auto pistol. These
differences between the various weapon types and gloves could be potentially used to
clarify the situation at crime scene and should be considered for interpretation of GSR
results.
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