Mont. Code Ann. § 37-61-410

Sections 37-61-407 through 37-61-409 do not prohibit the receipt by an attorney or counselor of a bond, promissory note, bill of exchange, book debt, or other thing in action in payment for property sold or for services actually rendered or for a debt antecedently contracted or from buying or receiving a bill of exchange, draft, or other thing in action for the purpose of remittance and without intent to violate any of those sections.