Don't know but will research...maybe it was only the cop trying to avoid me buying a detector...I thought it was only receiving not sending
Found this, there is such a thing as a radar detector, detector...
A Radar Detector Detector? Can Cops tell I have a Radar Detector?
Radar detector detector - well, you read it right! A radar detector detector, often referred to as a RDD in short, is a device used by cops in places where radar detectors are proclaimed illegal. Although not perfectly efficient (or accurate), RDDs help greatly in detecting motorists using radar...
www.brighthubengineering.com
Radar Detector Detectors: Everything You Need to Know - Vortex Radar
In areas where radar detectors are illegal, police commonly use radar detector detectors (RDD's) to locate drivers who are running radar detectors.
www.vortexradar.com
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