TrejosandDalzell (IMAGE) West Virginia University Caption Forensic scientists Tatiana Trejos, a WVU associate professor, and doctoral student Kourtney Dalzell prepare a carbon stub collected from the hands of a person of interest for direct examination of gunshot residue via laser-induced breakdown spectroscopy. 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.