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Gunshot residue, ten years later.
C G Wilber1, R K Lantz, P L Sulik
1Forensic Science Laboratory, Colorado State University, Fort Collins 80523.
The American Journal of Forensic Medicine and Pathology
|September 1, 1991
Summary
Gunshot residue analysis revealed lead, barium, and antimony, indicating a close-range shot. This forensic finding was crucial in a legal case involving a boy paralyzed after being shot.
Area of Science:
- Forensic Science
- Toxicology
- Materials Science
Background:
- A legal case arose from a shooting incident where a child sustained paralysis.
- The incident involved a .22-caliber revolver and allegations of horseplay and inadequate medical care.
Observation:
- Histopathological examination of the entry wound revealed "black pigment granules."
- These granules were analyzed using scanning, x-ray dispersive microscopy.
- Slides and tissue blocks from the original surgery were retrieved after 10 years.
Findings:
- Microscopic analysis identified significant levels of lead, barium, and antimony in the pigment granules.
- These elemental concentrations indicated gunshot residue (GSR).
- The GSR composition and distribution allowed for the determination of a close firing range (6-12 inches).
Implications:
- The forensic analysis of gunshot residue provided critical evidence for the legal case.
- This case highlights the importance of GSR in reconstructing shooting incidents and determining liability.
- The findings facilitated a prompt out-of-court settlement.