. . .(would have to put some kind of restriction on the distance they could go with their mobile emitters so they don't escape, of course).
That's easy. If they're only confined to your house and property, just have standard emitters. If they're using mobile emitters (for shopping errands, etc.), then your vehicle has a transmitter that keeps them from going beyond X meters.
Edit: And if they do try to escape, the vehicle transmitter automatically programs them to sing "Freebird" at the top of their lungs until they're arrested.