Is there actually such thing as "dual residency" you state in the OP he lives in MD making MD his primary state of residence. I would imagine MSP will tell him that he should have registered his vehicle and license etc etc when he moved here
ok, I will tell him to call MSP. Just wanted to see if I could get a quick, definitive answer on here first. Thanks!
My family had friends that moved to DE, but kept their MD home. They had to document every day they "lived" in DE versus MD. Otherwise they were considered MD residents. Especially for tax purposes.