According to the guidance issued by the Financial Crimes Enforcement Network (FinCEN) and the federal banking agencies, a financial institution is legally permitted to discuss any aspects of the reported activity with the law enforcement officer who contacts them about the suspicious transaction report (SAR), as long as the officer provides appropriate credentials and a written request for the information. The financial institution is also legally permitted to send the deposit documents referenced in the SAR, as they are part of the supporting documentation that may be requested by law enforcement1 However, the financial institution is not legally permitted to provide copies of the customer's loan documents or explain the customer's loan payment history, as they are not directly related to the reported activity and may contain confidential information that is protected by privacy laws or contractual agreements. The financial institution should only disclose the minimum amount of information necessary to respond to the law enforcement request and should not volunteer any information that is not relevant or requested12 Reference:
1: Answers to Frequently Asked Questions Regarding Suspicious Activity Reporting and Other Anti-Money Laundering Considerations, FinCEN and Federal Banking Agencies, 2021, Question 1
2: The best practices for effective Suspicious Activity Reporting, The Payments Association, 2020