If the customer is committing fraud, I'd get that SAR out as soon as you can assemble the information, and give the customer the boot as soon as possible. You don't want any of the fraudulent actions of your customer coming back to involve the bank in a loss or risk of a besmirched reputation (for banking the SOB).
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8