Section 23. Formal Investigation. —

1. Administrative investigations conducted by the Office of the Ombudsman shall be in accordance with its rules of procedure and consistent with due process.

2. At its option, the Office of the Ombudsman may refer certain complaints to the proper disciplinary authority for the institution of appropriate administrative proceedings against erring public officers or employees, which shall be determined within the period prescribed in the civil service law. Any delay without just cause in acting on any referral made by the Office of the Ombudsman shall be a ground for administrative action against the officers or employees to whom such referrals are addressed and shall constitute a graft offense punishable by a fine of not exceeding Five thousand pesos (P5,000.00).

3. In any investigation under this Act the Ombudsman may: (a) enter and inspect the premises of any office, agency, commission or tribunal; (b) examine and have access to any book, record, file, document or paper; and (c) hold private hearings with both the complaining individual and the official concerned.