A weapons expert testified Thursday that the firing pin in the rifle allegedly used in the killing four years ago of a Bexar County sheriff’s sergeant appeared to have been altered by a sharp ...

In general, there are several ways a gun can be linked to a crime: striations on a bullet, gunpowder residue, trajectory, ricochet and bullet holes, hidden fingerprints, firing pin impressions and ...

Experts can often identify the weapon used based on rifling impressions on the bullet, or breech face and firing pin impressions in the primer at the base of the cartridge case.

Reattaching that firing pin into an undamaged, identical weapon would allow him to test fire it, he said, and determine whether the firing pin impression matched casings found at the scenes and at ...

New National Institute of Standards and Technology standard will help police link cartridge cases recovered at crime scenes to specific firearms.

LONDON, Ohio (WCMH) — An award of $9.2 million to the Attorney General’s office and $1.3 million to the Ohio State Highway Patrol will give access to ballistics testing machines for eve… ...

The NIBIN machine requires two pairs of human eyes on the casing data. The first person searches for marks and firing pin impressions, and the second person verifies the test.

It’s the forensic analysis after every shooting that helps investigators build their criminal cases and a database that stands 42,000 forensic images strong of Connecticut’s shootings.