Section 86Local Government Code of 1991 (Republic Act No. 7160), Sec. 86

Administrative Investigation. - In any local government unit, administrative investigation may be conducted by a person or a committee duly authorized by the local chief executive. Said person or committee shall conduct hearings on the cases brought against appointive local officials and employees and submit their findings and recommendations to the local chief executive concerned within fifteen (15) days from the conclusion of the hearings. The administrative cases herein mentioned shall be decided within ninety (90) days from the time the respondent is formally notified of the charges.