Discuss matching shell casings and "microstamping" and the issues associated with it
What will be an ideal response?
It is possible to match a shell casing found at a crime scene to the gun that fired it based on "tool" marks impressed on the shell casing. When a gun is fired, expanding gases in the barrel cause the cartridge shell to forcefully strike parts of the rifle. This collision results in tool marks from the rifle being impressed on the shell casing, and then the casing and the rifle can be matched by scientific testing. Like bullet fragment matching, however, a shell casing is helpful only if a database of rifle markings exists. There has been encouragement for a law that creates a national database that would require every gun manufactured to have a microstamp inside the gun that would enable the gun to be matched to a shell casing, but again organizations like the NRA have resisted microstamping. Another issue relates to problems with the patents held on the microstamping process.
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