29 C.F.R. § 2702.4
(2) Complex track. In unusual circumstances, it may not be possible for the agency to reach a determination within 20 business days. When additional time is needed to respond to the initial request, the Commission shall notify the requester in writing within the 20 business day period, describe the circumstances causing the delay, and indicate the anticipated date for a substantive response that may not exceed 10 additional business days, except as provided in paragraph (b)(2)(i) of this section.
(i) Unusual circumstances that may warrant delay include:
(3) Expedited track. While it is recommended that a request for expedited services be submitted with the initial § 2702.3(a) request, such request may be made at any time. A person may request expedited processing of a § 2702.3(a) request for records in cases where the requester can demonstrate a compelling need for said records. Requesters will be notified of the determination in accordance with paragraph (d)(4) of this section. A demonstration of compelling need by a person making a request for expedited processing shall be made by a statement certified by such person to be true and correct to the best of his or her knowledge and belief. For purposes of this paragraph (b)(3), a “compelling need” means: