So lets have it. Whos done some tinkering with the thought. Seeing that some people here frequent ham and radio meets. I figured some have messed around with them
I myself bought one of those "passive" jammers/scramblers way back when and after a few tickets bought me a radar gun to find out they didnt work
I then built me an active jammer that jammed on X and K bands only to find out how highly illegal they were and got it taken away. The cool thing was, it worked really really well and you could dial in the speed you wanted it to display on the cops display screen. Now a days the parts are nearly impossible to find.
http://www.remotesystems.com/ecm.htm
Some short lived commercially available active jammers were on the market, the Phantom RCD and Scorpion Ka RCD but the FCC nailed the guy making them.