Welcome to the Alabama
Department of Forensic Sciences
FIREARMS EXAMINATION

Firearms Examination

Firearms are a tool that produces tool marks when it comes into contact with a cartridge case or bullet. Physical contact between a tool and the surface of an object produces marks not only characteristic of the type of tool used, but marks that may be individual to a single tool.

Examples of these types of tool marks are a bullet passing through the barrel of a firearm and/or a cartridge case in contact with the breech face/firing pin of a firearm. In each instance, the working surfaces of the tool can leave their individual characteristics upon the damaged surface of an object.


Laboratory Tests Performed

  • Comparison of the questioned bullets or cartridge cases to each other or known firearm to determine common origin
  • Bullet caliber classification (General Rifling Characteristics)
  • Shotgun component analysis (pellets, shot & waddings)

Bullet Comparison



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