College students, in Maine at least, are exempt. They continue to be residents of their “home” states.
The “straight and narrow” here is that if you’re temporarily working (as is seemingly the case here), or living on campus, you do NOT become a resident of that state.
If these guys had wanted to, they could easily have switched over to Maine DLs and plates...and then when they moved back to NJ later this spring (as they were likely always planning to do), switched them back? Because THAT makes sense
Literally the only thing these guys might run afoul of, is that they may be required to file their taxes as if they were ME residents (ME income tax on ALL income, no just what was earned in ME), but at the end of the day, renting a house in order to live someplace while you work a construction job does NOT constitute a change in residency.