Screening technologies with names like millimeter-wave and backscatter X-ray can show the contours of the body and reveal foreign objects. Such machines, properly used, are a leap ahead of the metal detectors used in most airports, and supporters say they are necessary to keep up with the plans of potential terrorists.
“If they’d been deployed, this would pick up this kind of device,” Michael Chertoff, the former homeland security secretary, said in an interview, referring to the packet of chemicals hidden in the underwear of the Nigerian man who federal officials say tried to blow up the Northwest Airlines flight.
Read more here: Debate over Full-Body Scans vs. Invasion of Privacy Flares Anew after Incident