Investigation must be conducted to determine if there is sufficient evidence that a crime has been committed. Once preliminary investigation has been conducted, the prosecutor will determine if there is indeed a probable cause, which refers to the existence of circumstances and facts as would excite the belief.
A preliminary investigation will be required in warrantless arrests cases. A person who is lawfully arrested without a warrant involving an offense which requires a preliminary investigation, the complaint or information may be filed by a prosecutor without need of such investigation provided an inquest has been conducted in accordance with existing rules.
RULE 112 - PRELIMINARY INVESTIGATION
Section 1. Preliminary investigation defined; when required. – Preliminary investigation is an inquiry or proceeding to determine whether there is sufficient ground to engender a well-founded belief that a crime has been committed and the respondent is probably guilty thereof, and should be held for trial.
Except as provided in Section 7 of this Rule, a preliminary investigation is required to be conducted before the filing of a compliant or information for an offense where the penalty prescribed by law is at least four (4) years, two (2) months and one (1) day without regard to the fine.
Procedure in Conducting Preliminary Investigation
The preliminary investigation shall be conducted in the following manner:
(a) The complaint shall state the address of the respondent and shall be accompanied by the affidavits of the complainant and his witnesses, as well as other supporting documents to establish probable cause. They shall be in such number of copies as there are respondents, plus two (2) copies for the official file. The affidavits shall be subscribed and sworn to before any prosecutor or government official authorized to administer oath, or, in their absence or unavailability, before a notary public, each of whom must certify that he personally examined the affiants and that he is satisfied that they voluntarily executed and understood their affidavits.
(b) Within ten (10) days after the filing of the complaint, the investigating officer shall either dismiss it if he finds no ground to continue with the investigation, or issue a subpoena to the respondent attaching to it a copy of the complaint and its supporting affidavits and documents.
The respondent shall have the right to examine the evidence submitted by the complainant which he may not have been furnished and to copy them at his expense. If the evidence is voluminous, the complainant may be required to specify those which he intends to present against the respondent, and these shall be made available for examination or copying by the respondent at his expense.
Objects as evidence need not be furnished a party but shall be made available for examination, copying, or photographing at the expense of the requesting party.
(c) Within ten (10) days from receipt of the subpoena with the complaint and supporting affidavits and documents, the respondent shall submit his counter-affidavit and that of his witnesses and other supporting documents relied upon for his defense. The counter-affidavits shall be subscribed and sworn to and certified as provided in paragraph (a) of this section, with copies thereof furnished by him to the complainant. The respondent shall not be allowed to file a motion to dismiss in lieu of a counter-affidavit.
(d) If the respondent cannot be subpoenaed, or if subpoenaed, does not submit counter-affidavits within the ten (10) day period, the investigating office shall resolve the complaint based on the evidence presented by the complainant.
(e) The investigating officer may set a hearing if there are facts and issues to be clarified from a party or a witness. The parties can be present at the hearing but without the right to examine or cross-examine. They may, however, submit to the investigating officer questions which may be asked to the party or witness concerned.
The hearing shall be held within ten (10) days from submission of the counter-affidavits and other documents or from the expiration of the period for their submission. It shall be terminated within five (5) days.
(f) Within ten (10) days after the investigation, the investigating officer shall determine whether or not there is sufficient ground to hold the respondent for trial.
