How long does gunshot residue last?
Moreover, how long does GSR stay on clothes?
Secondly, how is gunshot residue detected? Gunshot residue contains burned particles (potassium nitrite) and some unburned particles (potassium nitrate), and for decades criminal investigators collected these particles by applying melted paraffin wax to a subject's hands.
Then, how long does a gunshot residue test take?
30 to 40 minutes
Where is GSR evidence typically collected?
In an investigation, there are three main places that are examined for gunshot residue: the hands, clothing, and the area surrounding the shooter. Hands are the most common place to collect gunshot residue from a suspected shooter.