1) Would require for you to establish a baseline current draw. If your car has already been equipped with the tracking device, it might be very difficult as they are extremely well hidden and the owner is rarely informed of the location. Current draw also varies depending on aftermarket accessories installed, such as car alarms.<p>2, 3) Like in a multiple level underground parking lot?, that might work.<p>It is technically possible but probably beyond what the average new car buyer is willing to do.<p>What car thieves do is to drive the newly stolen car as far as they can in as little time as possible and park it somewhere public. And wait. If its not recovered after a day or two, they assume its not being tracked. (they remove the stereo, ecu and other valuable components in the meantime)