When a technician uses a mask and a face shield (video) American Institute of Physics Share Print E-Mail Loading video... Caption When a technician uses a mask and a face shield, the shield prevents droplets that leak from the mask from falling on a client below. Credit Keiko Ishii Usage Restrictions Journalists may use this video only with appropriate credit. Share Print E-Mail 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.