For a few weeks in July 2006, according to Scientific American, a commuter rail station in New Jersey enjoyed the same screening protection as that surrounding the soldiers and civilians in Baghdad's Green Zone.Using millimeter waves -wavelengths of light shorter than microwaves but longer than infrared - a walk-through portal produced images of passengers before they boarded the trains. Like an x-ray, the technology creates a revealing picture that can highlight items, such as plastic guns, that typical transit security sensors fail to detect.
The challenge now is to get the technology to work at a stand-off distance.
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