Abstract
"Class Characteristic Classification of Test Fired Cartridge Cases: A Digital Image Decision Tree Approach to Kennington’s Matrix for Initial Stages of Criminal Investigation"
Highlights
When a gun is fired, ammunition components are transferred to a crime scene
What is more important in a no-gun crime scene for criminal investigations “What was the make/ model of 9 mm gun used?” While ammunition components such as bullets are currently in an electronic General Rifling Characteristic (GRC) database maintained by the FBI for this exact purpose of possible gun type determination, the list of brands generated is often quite lengthy
Within “Large” is the folder corresponding to the Beretta 92FS with the characteristic large firing pin aperture mark of approximately 17 grid units (3.15 mm) which has been described previously as “primer blowback” or “pillow-like (Figure 3).”
Summary
When a gun is fired, ammunition components are transferred to a crime scene. The ammunition components alone are a source of information about the gun fired. What is more important in a no-gun crime scene for criminal investigations “What was the make/ model of 9 mm gun used?” While ammunition components such as bullets are currently in an electronic General Rifling Characteristic (GRC) database maintained by the FBI for this exact purpose of possible gun type determination, the list of brands generated is often quite lengthy. A database and non-cumbersome standardized procedure for determining the brand of gun which fired a cartridge case based on detailed class characteristics is much needed in order for investigators and examiners to have images and quantitative measurements to support conclusions such as “what make/model is most likely.”.
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