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Updated: Oct 17, 2025

Preparation and Application of a New Bacterial Biosensor for the Presumptive Detection of Gunshot Residue
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Unusual soot pattern from suicidal handgun wound.

Stephen D Cohle1, Jeff Crump2

  • 1Kent County, Michigan Medical Examiner, Grand Rapids, Michigan, USA.

Journal of Forensic Sciences
|October 7, 2021
PubMed
Summary

Atypical soot patterns from a 9mm pistol gunshot wound revealed unique deposits caused by barrel ports. This finding aids in determining weapon type and muzzle-to-target distance in forensic investigations.

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Area of Science:

  • Forensic Science
  • Ballistics
  • Trace Evidence Analysis

Background:

  • Soot deposition typically forms a concentric ring around gunshot entry wounds.
  • The distance of soot deposition usually indicates muzzle-to-target range.

Observation:

  • A unique case involved a self-inflicted gunshot wound with two distinct 3mm soot deposits, 2cm from the entry wound.
  • This atypical pattern differed from typical concentric soot rings.

Findings:

  • Test-firing the 9mm pistol reproduced the unusual soot deposits.
  • The deposits were traced to two specific ports located on the top of the pistol's barrel.

Implications:

  • Analyzing atypical soot patterns can provide crucial forensic information.
Keywords:
GSRatypical soot depositsballisticscloth and skin injuriesfirearmsgunshot residuegunshot woundsoot

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  • This analysis may help identify the specific firearm and muzzle-to-target distance, even in unusual cases.