Hmmmm. Inject propane into the exhaust tip, a spark plug and an ignition coil and a capacitor and resistor to cycle the coil, and a switch...
Wonder how fire proof their little sensor is?
Actually I am waiting for the day when I have my little CO/ combustible gas detector and walk over and test the exhaust coming out of the generator that runs their equipment. I am sure it comes out absolutely pure oxygen instead of the 700ppm CO like all the other little generators.
OK. Why would a counter-measure not include placing a light bar on the back of your vehicle that emits in whatever frequency spectrum they are monitoring? No different than a jammer operating on any other freq-not a big deal.
Actually, my in your face fantasy is to set up a sniffer station at one of the save the earth bike rides they keep having here and force the participants to --ahem-- get tested before they can use the public roads.