"Los Angeles officials announced Tuesday that the city's subway will become the first mass transit system in the U.S. to install body scanners that screen passengers for weapons and explosives.
The machines scan for metallic and non-metallic objects on a person's body, can detect suspicious items from 30 feet (9 meters) away and have the capability of scanning more than 2,000 passengers per hour.
...The screening process is voluntary, Wiggins said, but customers who choose not be screened won't be able to ride on the subway."
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