Answer:
There is no explicit legal standard that indicates when a bank can be certain that its customer is the individual described in a subpoena. If you are not certain, go back to the party demanding the records and ask for any additional identifiers they may have. Also, please note that (other than grand subpoenas and national security letters) the customer is notified of the demand for information and could be expected to protest if he's not the appropriate person.Do not assert "bank policy" in response to a judicial subpoena.
First published on BankersOnline.com 1/9/12