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Bullets fired from guns have distinct markings, as unique as fingerprints.Almost every bullet fired from a gun, can be traced back to that gun using a microscope.

Ballistic evidenceincluding gunshot residue, angle of trajectory, distance from the target, bullet entrance and exit marks, and damageare often used to reconstruct the events that transpired in the commission of a crime.

At the time of purchase, the code or serial number would be recorded along with the purchaser's information by a licensed dealer. Later, when a bullet or cartridge case is found at a crime scene, the bullet or spent cartridge could be quickly traced back to the purchaser.

Forensic ballistics involves the examination of evidence from firearms that may have been used in a crime. When a bullet is fired from a gun, the gun leaves microscopic marks on the bullet and cartridge case. These marks are like ballistic fingerprints.Cartridge cases are compared in the same way.

The Integrated Ballistic Identification System (IBIS) is used to associate evidence in previously unsolved crimes. IBIS is a highly technical, computerized image analysis system that records striated images from bullets and cartridge cases and compares them to a national, and growing international, database of images.

How is Ballistic Evidence Used in Court? Any bullets left at the scene of a crime are collected by investigators and analyzed by forensic ballistics experts. These analysts examine rifling in the spent bullet, which can help identify the firearmor at least the type of firearmused in the commission of the crime.

1. Interior ballistics is the branch of the science that deals with the projectile while it is still in the gun. 2. Transitional ballistics is the branch of the science that deals with the motion of the projectile from the time it leaves the muzzle until the only forces acting upon it are due to exterior ballistics.