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Interior ballistics deals with the interaction of the gun, projectile, and propelling charge before emergence of the projectile from the muzzle of the gun.

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 firearm?or at least the type of firearm?used in the commission of the crime.

At first glance, the field of ballistics analysis seems almost completely accurate. Error rates of about 1% are widely-reported, ensuring that everyone simply accepts this evidence at face value. But recently, experts have begun to question whether these error rates are actually telling the whole story.

Highlights. A total of 173 qualified forensic firearms examiners made 8640 comparisons. False-positive error rate: 0.656% (bullets) and 0.933% (cartridge cases).

For roughly a century, forensic ballistics experts have been comparing bullets and cartridge cases by visually examining them under a split-screen microscope. After comparing the bullets, the examiner can offer an expert opinion as to whether they match but cannot express the strength of the evidence numerically.

The first step in the Comparison Process is to test fire the firearm into a water tank in the lab. The second step involves using a comparison microscope to compare the test bullet to the bullet recovered from the victim or crime scene.

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 firearm?or at least the type of firearm?used in the commission of the crime.

Firearm examiners use a comparison microscope to simultaneously view and compare two cartridge cases or bullets. The microscope magnifies the specimens allowing examiners to see very small marks left on their surfaces during the firing process.

Ballistic fingerprinting efficacy as a tool of forensics is a matter of some controversy. On the one hand, many lawenforcement officials insist that ballistic fingerprints are as useful as ordinary fingerprints in linking a round of ammunition to a specific gun.

A comparison microscope is used for the examination of fired bullets, bullet fragments and cartridge/shotshell cases.