The same customer goes into a bank each day and purchases bearer instruments with cash...

According to the ACFE Fraud Examiners Manual, Law Section, particularly in the Money Laundering chapter discussing International Anti-Money Laundering Efforts and the FATF Recommendations , financial institutions are required to file suspicious transaction reports STRs when they suspect that funds are the proceeds of criminal activity or are related to money laundering or terrorist financing.

The conduct described—purchasing bearer instruments with cash in amounts just below mandatory reporting thresholds—is commonly known as structuring. Structuring is a recognized money laundering technique designed to evade currency transaction reporting requirements. Under the FATF Recommendations, financial institutions must not rely solely on monetary thresholds to trigger reporting obligations. Instead, they are required to file a suspicious transaction report whenever there is reasonable suspicion of illicit activity, regardless of the amount involved.

A cash transaction report is typically triggered by transactions exceeding a specific monetary threshold, but structuring to avoid that threshold does not eliminate the reporting obligation. If employees suspect money laundering, the bank is obligated to file a suspicious transaction report with the appropriate authorities.

Therefore, the correct answer is that the bank is required to file a report of suspicious transactions because the employees suspect money laundering violations.