Only a lawyer admitted in Iowa, or a person working under that lawyer's direct supervision, may sign on the trust account or authorise transfers out of it. Receipts are banked intact, and deposit records are detailed enough to identify each item. Money leaves the account only by cheque payable to a named payee (never to cash) or by an authorised bank transfer.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.