I believe this is against the Constitution in two ways.
1. Interstate travel cannot be controlled by a state.
2. Requiring a self-quarantine without proof of infection is trying to control healthy people.
I would have no problem with required COVID-19 tests at the border or even just taking of temperature.
A 14-day self-quarantine is not realistic.
Maine says they’ll accept a negative WuFlu test result from within 72 hours of entering the state.
Have you tried to get a rapid PCR test?
In my neck of the woods they’re only available for first responders.