Government requests for information, formal and informal, as well as lawsuits involving the bank, should be fed into the suspicious activity process. As noted in the AmSouth consent decree, the people in charge of SAR investigations should be made aware of of these activities and conduct their own investigation.
However, SAR filing is based on the bank's actual suspicions in conjunction with the filing thresholds. Nothing outside of those instructions triggers an automatic SAR, not the receipt of a subpoena, a positive response to an OFAC hit, or a positive response to 314(a) hit.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.