Several cities and transit agencies have been working with the TSA to test the security devices.
Los Angeles will be the first U.S. city to deploy body scanners, similar to those used by airport security, in its sprawling transit system.
The city last fall partnered with the federal Transportation Security Administration (TSA) to test a portable body scanner at one of its busiest light rail stops, the 7th Street Metro Center Station. On Tuesday, Los Angeles announced that it is making the scanners a permanent part of its transit security.
Because they are portable, the scanners will be moved around from location to location. Passengers should not expect to see the devices at every station or every day. Los Angeles Metro said the scanners would “augment” its existing security measures.