I briefly went through their Protection Registry Act and it reaches back to 2004. It compares somewhat to the Do Not Call list. If the "crime" is commited in Michigan it doesn't matter where you live or where your biz is domiciled.
I'd say purge your data base of MI addresses so as to never be bothered with it. Or resend an opt-in to MI addresses if they have any $$$ marketing value.
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