When you picture a metal detector, you probably imagine a device that has a long shaft with something that looks like a small steering wheel attached to the bottom end. The user walks along the beach, ...

First developed for World War II, motion detectors have come a long way from the radar that pilots used way back then.

THE TECHNOLOGY’S EFFICACY. YEAH. WHEN IT COMES TO KEEPING SCHOOLS SAFE, SECURITY EXPERTS TELL ME A METAL DETECTOR ALONE IS NOT ENOUGH TO PREVENT WEAPONS FROM GETTING INSIDE. ACCORDING TO OFFICIALS ...