Since anyone planning to use their car to get away from the police would disable this device/software, only honest folks would have it enabled. So the only sure way for law enforcement to use it would be to disable the cars of innocent people to act as roadblocks in front of the pursued. And, of course, there would be an incentive for the pursued to figure out how to disable cars behind them. Doesn't seem like a game we should play. I mean, at least in my dystopian imagination.