When a gun is fired, several mechanical actions leave distinct impressions on the ammunition. These marks are primarily categorized into two types: 1. Striation Marks (on the bullet)
Barrel uniqueness in firearms: reliable forensic match? - Facebook
: The Integrated Ballistic Identification System (IBIS) is the hardware and software used to capture these high-resolution 3D images. bullet fingerprinting
: Microscopic flaws in the manufacturing process or wear and tear from use create a "signature" unique to that specific barrel. 2. Impression Marks (on the casing)
To manage these vast amounts of data, law enforcement uses specialized databases and imaging systems. When a gun is fired, several mechanical actions
: The hooks and pins that pull the spent casing out and toss it away leave distinct scratches on the rim. The Technology of Tracking
The shell casing is also marked by various parts of the firearm's internal mechanism: - Facebook : The Integrated Ballistic Identification System
: These systems can often provide investigative leads within 24 to 48 hours by flagging potential matches across different crime scenes. Limitations and Controversies