Yes. Only if the kill switch is wired within the ignition to prevent starting of the vehicle or, like in the case of bait cars, its activated to stop the vehicle if its stationary and running via GPS or if the officer or whoever actually has eyes on it and seems it safe to activate.Yes it's an ignition kill switch or any switch in infact. Who said it had to be a power supply? Could be a switch to permanently sound the horn for attention.There's ways to put the car into limp mode without totally stopping the vehicle dead immediately. Booby traps are illegal, a device designed to cause harm when activated. A kill switch is an immobilizer device set to disable the vehicle when activated regardless of vehicle is in motion or not. Completely legal, also confirmed with police.
Typically they don't need to be left in it. If they are left in a broadcast able location (just inside the front door), the constant signal the key gives off for the KESSY can be boosted. It's generally good practice to keep the keys well away from the front door, or any windows.Immobilizer on these is difficult (impossible?) to overcome. Were the keys left in it?