His car surely has GPS; in a situation like this, you would think a person who truly wanted to avoid breaking the rules would have more than one method of detecting if he ventured too close to a state line—a possibility he had to be aware of because he’s from that area, near state boundaries. There are apps that will tell you if you go outside a specified boundary. He undoubtedly has some kind of smartphone even if it’s not his original. Why would you drive anywhere near a state line under these conditions?
If you told a teenage child to stay within the town limits or lose the freedom of driving and other privileges, surely the child would make every effort not to get outside the limits—or the child would be spending a lot of time doing chores while being grounded.
Really, this seems similar to FD’s audacity in telling JD he was going to have MT and her child move in the house with them all. This, too, is over the top and a giant diss to the judge. In his comment, NP sounded like someone whistling in the dark. Perhaps he is starting to realize who and what his client truly is, not that he would admit it.