Rules on Criminal Procedure
Section 2. Officers authorized to conduct preliminary investigations. -
The following may conduct preliminary investigations:
(a) Provincial or City Prosecutors and their assistants;
(b) Judges of the Municipal Trial Courts and Municipal Circuit Trial Courts;
(c) National and Regional State Prosecutors; and
(d) Other officers as may be authorized by law.
Their authority to conduct preliminary investigations shall include all crimes cognizable by the proper court in their respective territorial jurisdictions. (2a)