Tag: breechface signature

Toolmark Identification: Breechface and Extractor Signatures in Firearm Forensics

Toolmark Identification: Breechface and Extractor Signatures in Firearm Forensics

Breechface and extractor signatures are microscopic marks left on cartridge cases by firearms during firing. These unique toolmarks allow forensic examiners to link spent casings to specific guns, playing a critical role in criminal investigations. With advances in 3D scanning and digital analysis, this method remains one of the most reliable tools in forensic ballistics.

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forensic photography chain of custody expert testimony evidence markers crime scene documentation firearm trace eTrace homicide weapons ATF firearm tracing gun trace database impact spatter high-velocity bloodstain patterns forensic blood analysis bloodstain pattern interpretation crime scene forensics threat letters anonymous notes psycholinguistic analysis forensic linguistics criminal profiling

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