Is there a standard or acceptable period of time that if an acct has been closed for said period, the bank is not required to go back and investigate transactions from when it was open?
Actually, there is no written standard that says you are required to look at your
existing accounts when your customer makes headlines. It just falls under the heading of enhanced due diligence. Personal opinion only, the fact the account is closed or has even been closed for a long time would not affect my curiosity, but it would definitely affect the amount of time I would spend investigating.