Tenn. Code § 45-10-110
Except as hereinafter provided, when a subpoena duces tecum is served upon a custodian of records of any financial institution in an action or proceeding in which the financial institution is not a party, and the subpoena requires the production of all or any part of the records of the financial institution relating to any customer of the financial institution, it shall be sufficient compliance with the subpoena if the custodian within fourteen (14) days after being served with a subpoena duces tecum, files with the court clerk or the issuer, either by personal delivery or certified or registered mail, a true and correct copy, which may be a copy reproduced on film or other reproducing material by microfilming, photographing, photostating or other approximate process, or a facsimile, exemplification or copy of the reproduction or copy of all records specifically described in the subpoena.
T.C.A. § 45-10-110