Anti-tampering tag (IMAGE) Massachusetts Institute of Technology Caption After passing through the tag and striking the object’s surface, terahertz waves are reflected, or backscattered, to a receiver for authentication. Credit Courtesy of Ruonan Han, Eunseok Lee, et al Usage Restrictions Images are made available to non-commercial entities, press and the general public under a Creative Commons Attribution Non-Commercial No Derivatives license. You may not alter the images provided, other than to crop them to size. A credit line must be used when reproducing images 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.