The emitter that I posted about and any surplus police radar on ebay will not interfere with any police radar in use by our fine officers of the law out there.
Think about a section of our jet fighters rolling in on the bad guys in Afganistan from ten thousand feet. The radar in each plane does not interfere with the radar or other electronics in the other planes and it puts out hundreds of times more energy that speed radar.
As a radar detector user you probably know there is a lot of stray RF out there with security systems, automatic door openers, microwave comm towers, speed signs and the drone emitters the DOT puts in cronstuction sites to try to slow people down. All that stray RF affects sensitive radar detectors but not the emitters themselves. Otherwise doors would be opening themselves etc. etc. The FCC did shut one company down which sold Radar jammers, which is of course illegal.
I would never do anyhing to interfere with our law enforcement.