FILE - In this Tuesday, Feb. 27, 2018 file photo ThruVision suicide vest-detection technology reveals an suspicious object on a man, at left, during a Transportation Security Administration demonstration in New York's Penn Station. Los Angeles is poised to have the first mass transit system in the U.S. with body scanners that screen passengers for weapons and explosives. Officials from the Los Angeles County Metropolitan Transportation Authority and the Transportation Security Administration have scheduled a Tuesday, Aug. 14, 2018, news conference. The TSA has been working on the experimental devices, known as standoff explosive detection units, since 2004 with transit agencies. They hadn't been deployed permanently at any transit hub. (AP Photo/Richard Drew,File)
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