The device, called the Range-R, operates like a stud-finder except instead of detecting studs inside a wall, it detects motion beyond the wall, including breathing as far as 50 feet away.
The U.S. Supreme Court has previously ruled that police may not use high-tech devices to see inside people's homes without a warrant, raising questions about how this device has so far been used.
The FBI did not respond to NPR's request for comment. The US Marshals referred questions about their use of the device to the U.S. Justice Department.
Justice Department spokesman Patrick Rodenbush declined to say how and how often the device was being used but said in a statement that the department is looking over an appellate court ruling out of Denver that questioned the use of the device.
The Radar-R is made by L-3 Communications, which develops military and police
According to USA Today, the company has sold 200 of the devices to 50 law enforcement agencies.
The company's website says the Range-R is a "highly sensitive handheld radar system" that can sense movement through walls constructed of "common building materials."
It says the device works in seconds with "continuous wave radar technology." CyTerra suggests it would be useful for firefighters, search and rescue teams, and police and swat teams.
The Denver federal appeals court cited an instance the device was used in a ruling last month. In that case, officers used the Radar-R to locate a parole violator inside a home. The officers had a warrant for the arrest of the man but did not have a warrant to search the home.
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