Other than the specific instruction not to file a SAR for a bank robbery that's already been reported to law enforcement, I am not aware of any guidance suggesting that you don't file when you believe LE already is pursuing a matter. The theory is, and I think LE will back me on this, that even a SAR filed late in the game may include information that is useful to LE efforts.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8