5 C.F.R. § 1400.301
When an agency makes an adjudicative decision based on an OPM investigation or an investigation conducted under an OPM delegation of authority, or when an agency, as a result of information in such an investigation, changes a tentative favorable placement or clearance decision to an unfavorable decision, the agency must comply with all applicable administrative procedural requirements, as provided by law, rule, regulation, or Executive order, including E.O. 12968, and the agency's own procedural regulations, and must:
(c) At a minimum, subject to requirements of law, rule, regulation, or Executive order: