Radar Scope, developed by DARPA for the U.S. Military, is a hand-held radar device that penetrates 12 inch concrete walls and a further 50 feet into a building, and allows the user to determine if there’s anyone inside. The unit detects small movements, such as breathing.
Next up is “Visi Building”, a scaled-up version of Radar Scope. Visi Building will map out the contents of a multi-story building, and do so while driving past it or flying over it.
New Device Will Sense Through Concrete Walls – DefenseLink, Jan. 3, 2006
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I hope this doesn’t get into civilian hands. It could be a boon for stalkers and assorted creeps.