Undocumented workers never crossed my mind. I was remembering back to when I was a student and the requirements to prove I actually resided in this state vs the one I had moved from. I think at the time someone explained to me it was to prevent friends visiting friends for a couple of weeks from getting limited street parking permits in the area, which made sense at the time. Now, not really as much. Time is funny.
Reading this thread I'm not even sure I voted the way I finally settled on seeing that it was questioned backwards. At least now I get why it was a question in the first place. More info would definitely have been helpful.