6 C.F.R. § 5.23
(d) Adverse determinations of requests for access. A component making an adverse determination denying a request for access in any respect will notify the requester of that determination in writing. Adverse determinations, or denials of requests, include decisions that: the requested record is exempt, in whole or in part; the requested record does not exist or cannot be located; or the record requested is not subject to the Privacy Act or JRA. Further, adverse determinations also include disputes regarding fees, or denials of a request for expedited processing. The denial letter will be signed by the head of the component, or the component head's designee, and will include: