In the months following 9/11 such a system was installed in the Fresno/Yosemite International airport on a "trial" basis. I went through at about the T-plus 2 months point, and asked the (surprisingly) intelligent security supervisor what their false positive rate was. He stated "about 25%. We don't really rely on it."
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In the months following 9/11 such a system was installed in the Fresno/Yosemite International airport on a "trial" basis. I went through at about the T-plus 2 months point, and asked the (surprisingly) intelligent security supervisor what their false positive rate was. He stated "about 25%. We don't really rely on it."