Yes,that did happen and,as a response,the New Hampshire legislature (controlled by RATS,surprisingly) passed a law forbidding NH businesses to do what MA tried to force them to do (the malls on the border are very important to NH's economy).
And as for border guards,I've read that MA has already tried that.I've read that they have state cops cruising the mall parking lots (in unmarked cars) looking for MA plates.I'm not sure if it's true but I can *absolutely* see them doing it (two of the biggest malls are literally within sight of the state border).I know that they've done that for fireworks....which are legal in NH and illegal in MA.
Pennsylvania tried that with liquor a few years back. They had people noting license numbers of PA cars parking at NJ liquor stores just across the river from Philadelphia. The cars would then be pulled over at the bridge toll booth.
The uproar from NJ put a stop to it.
>I’ve read that they have state cops cruising the mall parking lots (in unmarked cars) looking for MA plates.
Why do I imagine [MA people] shooting those guys because they were stalking them and they feared for their safety?