Somebody should tell Chris Christie that it might not be a good idea to downgrade from GPS tracking of the smart phone devices or from the malware which jumps over air.
I think that it is a bit naive to believe that you would not be tracked 24/7 already, it should not take a rocket scientist to create a software, when you have the unlimited federal funding (backed by the floating currency). All in all, I personally don't care if somebody wants to track me online or offline, it is their problem, and more likely if that gives someone their daily allowance for food and gadgets, so be it.
In general, going public and saying that we got your back and we track all the bad people and all the good people, is only going to hurt the good, and as long as people have faith that "no-one" knows what they are doing we are safe.
I think that the best idea ever would be that all immigrants would receive a smart phone with GPS chip for free for the duration of their visit, if they dont already own one. Then they would need to return the device when they leave the country. Then also those who don't have the iPhone or Android device, would be covered. And if you would want to be more efficient, you would provide them with prepaid visa or mastercard, which would then give you the "full profile" of their behaviour (more or less).
But what really makes me worried is that if they would treat you, like the FedEx treats their packages.