The common law marriage issue is a state prerogative, from my understanding.

If I had perfect knowledge of the legalities of possession, I would not be asking about them.

I don't question the traditional police power of the state in matters pertaining to the domestic tranquility of that state.

My question arises, when there is sufficient domestic tranquility, and someone is in possession of a Thing; and, the state (via legislation, from politics) has some concerns over which Things those citizens may possess.