Ask a Lawyer and Get Answers to Your Legal Questions
Thank you for your question.
My opinion is that such a policy would violate federal law:
31 U.S. Code § 5103 - Legal tender:
"United States coins and currency (including Federal reserve notes and circulating notes of Federal reserve banks and national banks) are legal tender for all debts, public charges, taxes, and dues. Foreign gold or silver coins are not legal tender for debts."
I hope this information is helpful.