Security personnel for the Littleton, Colo., school district are testing an experimental, portable security system that uses stored images of building interiors to aid police and rescue workers in the event of an emergency.

The system's developers say it could speed up emergency-response times while keeping police and rescue crews safer.

With the click of a triggerlike mouse, a SWAT team could use the system to call up a hard drive's stored images of a school's interior layout—including video of its hallways and classrooms—before they enter.

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