Shoe Scanner Technology (IMAGE) DOE/Pacific Northwest National Laboratory Caption An image of an F-shaped piece of metal, concealed in the sole of a shoe, is returned from the millimeter wave shoe scanner developed by PNNL and licensed to Liberty Defense. Credit Image courtesy of David Sheen | Pacific Northwest National Laboratory 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.