We are an OCC regulated bank and conduct a formal review of high risk accounts on a quarterly basis. This coincides nicely with 90 day follow up SAR's if necessary. General monitoring of accounts is done via monthly, weekly and in some cases, daily reports. Any major spikes or changes in activity would warrant an investigation.
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"100 victories in 100 battles isnt the most skillful. Subduing the other's military w/o battle is the most skillful." Sun-Tzu