Section 39
SEC. 39. Duties of prosecuting attorney; to have three assistants. The prosecuting attorney of the city of Manila shall have charge of the prosecution of all crimes, misdemeanors, and violations of city ordinances, in the Court of First Instance and the municipal courts of the city of Manila. He shall investigate all charges of crimes, misdemeanors, and violations of ordinances, and prepare the necessary informations or make the necessary complaints against the persons accused, and discharge all other duties in respect to criminal prosecutions enjoined upon provincial fiscals in the General Provincial Act and the Criminal Code of Procedure. There shall be three assistant prosecuting attorneys, who shall assist the prosecuting attorney as he shall direct. The prosecuting attorney or any of his assistants may, if he deems it wise, conduct investigations in respect to crimes, misdemeanors, and violations of ordinances by taking oral evidence of reputed, witnesses, and for this purpose may, by subpoena, summon witnesses to appear and testify under oath before him, and the attendance or evidence of an absent or recalcitrant witness may be enforced by application to the municipal court or the Court of First Instance. No witness summoned to testify under this section shall be under obligation to give any testimony tending to criminate himself, and no testimony elicited from a witness by such examination under oath before the prosecuting attorney or his assistants under this section shall be used against such witness in any prosecution pending, or thereafter instituted against him, for any crime or offense.