GSR collection from live subjects should be done within :
6 hours
Gunshot residue (GSR) consists of particles of primer (lead, barium, antimony) and partly burnt propellant deposited on the hands and clothing of the shooter.
On a living person these particles are lost rapidly through hand washing, wiping, rubbing against clothing and normal activity; studies show that most residue disappears within a few hours.
For this reason the recommended practice is to collect GSR from the hands of living subjects (by swabbing or SEM stubs) as early as possible, and not later than about 6 hours after the firing; samples taken after this period are usually of little value.
A limit of 2 hours is too restrictive to be the accepted cut-off, while 12 or 24 hours is far too long because a negative result after that time is meaningless on a live subject (for a deceased person whose hands are bagged, the period is longer).
Therefore GSR from a living subject should be collected within 6 hours.
Hence, 6 hours.
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