We use those Remote Kill boxes at my dealership. That's how we can sell cars to people with challenged credit. If they don't make the payment, we shut the car off till they do, or we come get it. Comes in very handy. You usually don't have any more payment problems out of people once you shut there car once or twice. (Ours don't kill the car while it's moving, but once they turn it off, it won't restart.)