NEWARK, N.J. — A passive security device that was used to screen crowds for explosives during Super Bowl 48 is being tested on NJ Transit's commuter rail system under a program being run by the Transportation Security Administration, NJ Advance Media reports.

Known as a passive threat analysis system, the equipment monitors riders by measuring body density as they pass by, but doesn't require them to stop and empty their pockets to be checked.

The deployment comes after a recent state Homeland Security office assessment determined that commuter rail systems have a moderate risk for terrorism because they are open to the public with multiple entrances, which are difficult to secure. It also said that ferries have a similar risk for the same reasons. For the full story, click here.