P.R. Laws tit. 34, § 521
Every felony shall be prosecuted through indictment filed by the corresponding prosecuting attorney in the court having jurisdiction in the case, in the manner provided by the Code of Criminal Procedure. When the prosecuting attorney, without justified cause in the judgment of the court, shall fail to prosecute a public official for the commission of a felony by reason of acts done in the exercise of his functions, the said judge may issue a warrant for the Grand Jury of his part to investigate the matter. The Grand Jury shall, in these cases, confine itself merely to reporting the action that the court should take, and if the judge finds that the proceedings of the Grand Jury have been in accordance with law and that probable cause exists, he shall direct the prosecuting attorney to file a complaint against the official involved. The Grand Jury shall also have power, motu proprio or at the request of the Court of First Instance, to investigate the administrative acts of public officials, and to investigate the offices and centers of government, submitting to the Governor of Puerto Rico, through the judge, a report of the result of its investigation, together with such recommendations as it may deem pertinent.
History —June 18, 1919, No. 58, p. 302, § 1; Aug. 28, 1925, No. 98, p. 788; July 9, 1936, No. 21, p. 156, § 1.