Treasury's FinCEN (Financial Crimes Enforcement Network), working with the federal banking agencies, has issued guidance designed to help banks prepare Suspicious Activity Report (SAR) forms. The Guidance on Preparing a Complete & Sufficient Suspicious Activity Report Narrative is a step-by-step guide to filling out the SAR and preparing complete narratives.
FinCEN also recently published the sixth issue of the SAR Activity Review. The Review provides feedback on reported suspicious activities and information on patterns and trends indicating criminal activities. Both the Review and the Guidance are available at www.fincen.gov.