Answer:
Generally, gunpowder residue on a shooter's hands can be detected soon after shooting but may start to diminish within hours or even minutes depending on the circumstances. However, traces of residue may still be present for a longer duration, especially if proper cleaning measures are not taken.
It is important to note that the presence of gunpowder residue on the hands alone does not necessarily indicate involvement in a specific shooting incident. Other factors, such as gunshot residue (GSR) analysis, forensic investigations, and additional evidence, are typically considered for a comprehensive assessment in forensic investigations.
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