Bullet Fingerprinting ⟶

: The National Integrated Ballistic Information Network is a federal database used to share digital images of ballistic evidence.

The shell casing is also marked by various parts of the firearm's internal mechanism: bullet fingerprinting

Despite its usefulness, "bullet fingerprinting" is not always a definitive proof of guilt. Several factors can complicate or even invalidate a match. 1. Barrel Evolution : The National Integrated Ballistic Information Network is

Barrel uniqueness in firearms: reliable forensic match? - Facebook bullet fingerprinting

: The hooks and pins that pull the spent casing out and toss it away leave distinct scratches on the rim. The Technology of Tracking