The FBI and the U.S. Marshals Service are among the agencies that have been given these radar systems, which work like finely tuned motion detectors, using radio waves to determine if someone is inside a home and whether they are moving.
The FBI and the U.S. Marshals Service are among the agencies that have been given these radar systems, which work like finely tuned motion detectors, using radio waves to determine if someone is inside a home and whether they are moving.