Radar as Motion Detector, See Through Walls

choi

Brad Heath, Police Can 'See' Through Your Walls; Critics blast surveillance tool--used secretly without a search warrant--as unconstitutional. USA Today, Jan 20, 2015 (front-page central report).
www.usatoday.com/story/news/2015 ... ugh-walls/22007615/

Quote:

"The radars work like finely tuned motion detectors, using radio waves to zero in on movements as slight as human breathing from a distance of more than 50 feet. They can detect whether anyone is inside of a house, where they are and whether they are moving.

"Agents' use of the radars was largely unknown until December, when a federal appeals court in Denver [ruled in

"By then, however, the technology was hardly new. Federal contract records show the Marshals Service began buying the radars in 2012

"The device the Marshals Service and others are using, known as the Range-R, looks like a sophisticated stud-finder. Its display shows whether it has detected movement on the other side of a wall and, if so, how far away it is — but it does not show a picture of what's happening inside. The Range-R's maker, L-3 Communications, estimates it has sold about 200 devices to 50 law enforcement agencies at a cost of about $6,000 each. Other radar devices have far more advanced capabilities, including three-dimensional displays of where people are located inside a building, according to marketing materials from their manufacturers. One is capable of being mounted on a drone. And the Justice Department has funded research to develop systems that can map the interiors of buildings and locate the people within them.

"The radars were first designed for use in Iraq and Afghanistan. They represent the latest example of battlefield technology finding its way home to civilian policing and bringing complex legal questions with it.

My comment:
(a) stud-finder
en.wikipedia.org/wiki/Stud_finder
(b) Its purpose:

What is a Stud Finder?
www.wisegeek.org/what-is-a-stud-finder.htm
(“A stud finder is a small device that allows the user to identify where wooden or metal beams are located behind walls [without breaching the drywall]. This can help the person to find good places to use nails or picture hangers”)
(c) Forget about courts. I am interested in how it works. So in the battlefields, a sniper can not hind any more?