The Feds have made "Mary Joe" the teller their little "special agent" in charge of watching out for what they, [the teller] think may be an illicit transaction.
"Bank Secrecy Act:
To comply with the requirements set forth under the Bank Secrecy Act, the Bank is required to report any customer cash transaction or multiple cash transactions totaling more than Ten Thousand Dollars ($10,000) to the Internal Revenue Service. The Bank also retains the right to report any suspicious transaction(s), which it feels, should be reported to comply with the provisions of the Act."