Carolyn Conte | Staff Writer When a shooter fires a gun, a puff of particle residue leaves the weapon’s muzzle and blankets the person who pulled the trigger. The presence of gunshot residue can be potentially damning evidence in a criminal case — and Duquesne researchers are making sure that evidence isn’t used to mistakenly convict innocents. Gunshot residue (GSR) can be used as evidence … Continue reading Gunshot residue subject of DU research