31 C.F.R. § 1010.312
Before concluding any transaction with respect to which a report is required under § 1010.311 , § 1010.313 , § 1020.315 , § 1021.311 or § 1021.313 of this chapter, a financial institution shall verify and record the name and address of the individual presenting a transaction, as well as record the identity, account number, and the social security or taxpayer identification number, if any, of any person or entity on whose behalf such transaction is to be effected. Verification of the identity of an individual who indicates that he or she is an alien or is not a resident of the United States must be made by passport, alien identification card, or other official document evidencing nationality or residence (e.g., a Provincial driver's license with indication of home address). Verification of identity in any other case shall be made by examination of a document, other than a bank signature card, that is normally acceptable within the banking community as a means of identification when cashing checks for nondepositors (e.g., a driver's license or credit card). A bank signature card may be relied upon only if it was issued after documents establishing the identity of the individual were examined and notation of the specific information was made on the signature card. In each instance, the specific identifying information (i.e., the account number of the credit card, the driver's license number, etc.) used in verifying the identity of the customer shall be recorded on the report, and the mere notation of "known customer" or "bank signature card on file" on the report is prohibited.
31 C.F.R. §1010.312