I do not know the answer to your question, but two thoughts cross my mind:
1. Your way is the same way we do it too (which I know does not make it right), and...
2. You have fully disclosed this in your forms and agreements when he opened the accounts, forms he signed stating that he understood and amazingly, *drumroll please* agreed to!
Question... are your forms created in-house, or do you use canned forms? If they are canned forms, call the company that provides and maintains them for you, and ask them to direct you in writing where they find their back-up for the statement. We use CSI, and they do a great job directing us to the spot in the IRS code or regs that back-up their wording, and that is a great tool to use with a customer.
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I don't repeat gossip, so listen closely...