GSRResearch1 (IMAGE) West Virginia University Caption In a forensic and investigative science lab at WVU, a researcher evaluates the persistence of gunshot residue by exposing an artificial membrane that simulates skin to a washing process. Credit WVU Photo/Matt Sunday Usage Restrictions NONE License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.