The Los Angeles County Metropolitan Transportation Authority will be it the first in the country to deploy body scanners on its rail system.

"Los Angeles County’s rail system will be the first in the United States to deploy body scanners that can detect suicide vests and other improvised explosives," reports Laura Nelson.
"Later this year, the Metropolitan Transportation Authority will deploy several portable scanners that can be moved to any of the system’s 93 subway and light-rail stations," adds Nelson. "The devices will be used in response to terrorism threats, or to scan large crowds at a station near a protest or a sporting event, officials said."
Nelson also explains the advancement in scanner technology that made the Thruvision scanner product, at the cost of $100,000, viable for Metro's budget.
Metro security chief Alex Wiggins is quoted in the article saying that transit riders must pass through security to access the system at locations where the scanners will be deployed.
FULL STORY: L.A.'s rail system will be first in the U.S. to use scanners that detect explosives

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Urban Design for Planners 1: Software Tools
This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.
Planning for Universal Design
Learn the tools for implementing Universal Design in planning regulations.
North Jersey Transportation Planning Authority (NJTPA)
Economic & Planning Systems, Inc.
UCLA Lewis Center for Regional Policy Studies
Mpact (formerly Rail~Volution)
Chaddick Institute at DePaul University
City of Piedmont, CA
Great Falls Development Authority, Inc.
HUDs Office of Policy Development and Research