OverTheGeicoE writes "The Electronic Privacy Information Center received more FOIA documents from the U.S. Department of Homeland Security regarding mobile x-ray scanners (a.k.a. Z Backscatter Vans). We've discussed these devices before. Perhaps the most interesting part is slide #11 ('Disclaimer About Scanning People') on page 6 of this PDF explaining that the radiation output of these devices is too high to comply with ANSI N43.17. In other words, they output too much radiation even by TSA's questionable standards for airport body scanners. Regardless, the slide ends with the author stating that the ANSI standard 'is not applicable to covert operations.' What might that assertion have meant to the presentation's intended audience?"