If you are in the US and you have GEICO insurance, they will revoke your insurance if you are caught with a radar/laser detector or jammer.
The don't speed argument would hold more water if speed limits where based on safety instead of revenue enhancement. Its not the driver's fault that our national and local govt live beyond their means.
BTW: I don't own a car, I get around by Mt. Bike, so traffic safety is important to me. But I'd rather see human cops focus on stuff like people who change lanes without signaling, unlicensed drivers (25% of drivers in my state don't have a license, insurance or a legal right to be in our country, and they generally "hit and run")