The road wouldn't help as it is in South Africa.
The reason I went for the magnetic switch is because magnetism travels through plastic, thereby, too actually find the switch the car interior has to be stripped. How many coppers carry toolboxes with them for that. Also, may he just randomly strip your car next to the road without a warrent?
Unless he has a magnet and knows exactly where to put it, jammer remains "broken". You are correct, I didn't add a mechanical switch, purely because it could easily be found and actuated. Will take pics of the switch and fitting tomorrow and post it so as to explain the idea better.