You have to go all the way back to FinCEN's
SAR Tips and Trends Issue 8. This was published in 2005. It notes that when investigating continuing activity, if new activity is discovered, that triggers an initial SAR filing within 30 days of identifying the new activity..
For situations where the nature of the activity reported changes after the original Suspicious Activity Report filing, the suspicious activity is no longer considered “ongoing”--e.g., the customer in the above example begins sending or receiving funds in addition to making structured withdrawals. In such cases, the institution should consider the changed activity a new transaction and should file a new Suspicious Activity Report within the normal filing deadlines, rather than updating a previous filing after 90 days.
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