A relative from Massachusetts came to visit for a few days last week. A medical professional, he was able to get a COVID test and (negative) results, all within 3 days of his arrival in Maine (as ME Governor rules require, if not quarantining for 14 days). The "3 days" timetable is literally impossible to accomplish in Massachusetts right now, due to the sheer volume of testing demands on people, supplies and lab capacity.
I hadn't thought too deeply about this, but he pointed out how ineffective (i.e., borderline silly) that "3 days" requirement is, since the test is only a "snapshot" of a moment in time (from several days ago). Anyone could become infected anytime
after leaving the testing facility, arrive in Maine with documentation of their (now obsolete and inaccurate) negative test results, and proceed to travel around the state at will, potentially infecting others, while carrying (inaccurate) hard copy documentation of negative COVID test results in their pocket. Our relative never left our immediate area, content to just relax and decompress for a few days before returning to the fray.
I don't claim to have any brilliant insights on this matter and nothing in my life depends upon any incoming tourist money, but he did cite the interesting statistic that historically, 40% of all tourist dollars coming into Maine reportedly originate from Massachusetts.