National banks are encouraged, and in some cases, it's a little stronger than encouragement. See 12 CFR 21.11(e): Reports to state and local authorities. National banks are encouraged to file a copy of the SAR with state and local law enforcement agencies where appropriate.
See also 12 CFR 21.11(d), which reads, in relevant part: "In situations involving violations requiring immediate attention, such as when a reportable violation is ongoing, the financial institution shall immediately notify, by telephone, an appropriate law enforcement authority and the OCC in addition to filing a timely SAR."
State member banks follow similar language in the Fed's Regulation H at section 208.62 (paragraphs (d) and (e)). State non-member banks have similar language in the FDIC's regulations at 12 CFR 353.3(b)(2) and (c).
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8