So how do cops define a radar detector?

What if you disabled the detection part & just used it for SWS? What about if you had one on your dash that didn't work at all.. would that be illegal.

How do firearm laws work? if you own a gun but it doesn't work is that illegal. What about if you filled in the barrel & removed the pin, is it then a replica? Bit of a tangent but the same type of logic.

__________________
Ho's gotta eat too