Forensic tests for fingerprints and firearms?

Answer 1

There are many tests that may be conducted for fingerprints, and for firearms. With fingerprints, the most common is a comparison of a print from a crime scene to the prints of a suspect. With firearms, tests may be conducted to match the marking made on a fired bullet at a crime scene, to a bullet fired from a specific weapon. Firearms also leave distinctive markings on fired cartridges from the firing pin, and from the extractor that pulls a fired cartridge from a weapon. This might be used to match evidence on a fired cartridge left at a crime scene to a particular firearm. There are also tests conducted for gunshot residue on skin. When firing a gun, there are chemicals released into the air that can be deposited on skin. By testing for these, it can be determined if a person fired a gun, or was at least close to one being fired. In some cases, a firearm may be tested for DNA to match evidence left on a gun to a specific person.