ASU professor studies gun casing comparisons in trials

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Police and prosecutors use all sorts of methods to get convictions; some are more reliable than others. If someone’s on trial for the use of a gun in the commission of a crime, you might see prosecutors or defense attorneys use cartridge-case comparisons to prove innocence or guilt.This involves matching the shell casings at a crime scene to the gun that ejected them. But this kind of test isn’t always reliable, and sometimes experts come back with inconclusive results.