Christian Meissner and Dawn Sweet (IMAGE) Iowa State University Caption The video on the monitor is one that Christian Meissner (left) and Dawn Sweet (right) created to test how well police officers can detect if someone is concealing a weapon. Credit Christopher Gannon, Iowa State University Usage Restrictions None License Licensed 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.