First, if the customer has no open accounts, he is not a customer for CIP purposes even if the last account closed two days ago. You may use some of the same information you used last time, but you cannot use "current customer" to bypass ID verification altogether.
Second, the CIP information that you obtained (the four elements of ID) has to be retained for five years following the close of the account(s). The description of any document (like a license) relied on, or other methods used to verify the ID, and any resolution of a discrepancy, must be retained for five years from the creation of the record. (see 31 CFR 103, ยง 103.121(b)(3)(ii))
So you have two problems with deleting the CIP information. Note also that in 12/2008 opening the account with "existing customer" would be a violation even if you still had the information in file (because it isn't an existing customer!)
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8