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 Checkpoints are valid for as long as they are limited to a visual search. The vehicle must not be subjected to search; the occupants must not be subjected to a bodily search. (Valmonte vs. De Villa)
 A buybust is an entrapment operation made by police authorities against drug pushers.
 A motion to quash a search warrant and/or to suppress any evidence obtained thereof may be filed in and acted upon only by the court where the case has been instituted. If no criminal action has been instituted, the motion may be filed in and resolved by the court that issued the search warrant. (Section 14, Rule 126 of the Revised Rules of Criminal Procedure)
 There are several settled exceptions to the rule on a warrantless search:
- a search incidental to a lawful arrest;
- a search on a moving vehicle;
- seizure of evidence in plain view;
- when there is consent given by the person searched.
A search done when there is consent is subject to these requisites: (a) there is a right; (b) there is knowledge of the existence of such right; and (c) there must be intention to waive the right.
Search and Seizure (Rule 126, Revised Rules of Criminal Procedure)
Section 1. Search warrant defined. – A search warrant is an order in writing issued in the name of the People of the Philippines, signed by a judge and directed to a peace officer, commanding him to search for personal property described therein and bring it before the court.
Sec. 2. Court where application for search warrant shall be filed. – An application for search warrant shall be filed with the following:
(a) Any court within whose territorial jurisdiction a crime was committed.
(b) For compelling reasons stated in the application, any court within the judicial region where the crime was committed if the place of the commission of the crime is known, or any court within the judicial region where the warrant shall be enforced.
However, if the criminal action has already been filed, the application shall only be made in the court where the criminal action is pending.
Sec. 3. Personal property to be seized. – A search warrant may be issued for the search and seizure of personal property:
(a) Subject of the offense;
(b) Stolen or embezzled and other proceeds, or fruits of the offense; or
(c) Used or intended to be used as the means of committing an offense.
Sec. 4. Requisites for issuing search warrant. – A search warrant shall not issue except upon probable cause in connection with one specific offense to be determined personally by the judge after examination under oath or affirmation of the complainant and the witness he may produce, and particularly describing the place to be searched and the things to be seized which may be anywhere in the Philippines.
Sec. 5. Examination of complainant; record. – The judge must, before issuing the warrant, personally examine in the form of searching questions and answers, in writing and under oath, the complainant and the witnesses he may produce on facts personally known to them and attach to the record their sworn statements, together with the affidavits submitted.
Sec. 6. Issuance and form of search warrant. – If the judge is satisfied of the existence of facts upon which the application is based or that there is probable cause to believe that they exist, he shall issue the warrant, which must be substantially in the form prescribed by these Rules.
Sec. 7. Right to break door or window to effect search. – The officer, if refused admittance to the place of directed search after giving notice of his purpose and authority, may break open any outer or inner door or window of a house or any part of a house or anything therein to execute the warrant to liberate himself or any person lawfully aiding him when unlawfully detained therein.
Sec. 8. Search of house, room, or premises to be made in presence of two witnesses. – No search of a house, room, or any other premises shall be made except in the presence of the lawful occupant thereof or any member of his family or in the absence of the latter, two witnesses of sufficient age and discretion residing in the same locality.
Sec. 9. Time of making search. – The warrant must direct that it be served in the day time, unless the affidavit asserts that the property is on the person or in the place ordered to be searched, in which case a direction may be inserted that it be served at any time of the day or night.
Sec. 10. Validity of search warrant. – A search warrant shall be valid for ten (10) days from its date. Thereafter, it shall be void.
Sec. 11. Receipt for the property seized. – The officer seizing the property under the warrant must give a detailed receipt for the same to the lawful occupant of the premises in whose presence the search and seizure were made, or in the absence of such occupant, must, in the presence of at least two witnesses of sufficient age and discretion residing in the same locality, leave a receipt in the place in which he found the seized property.
Sec. 12. Delivery of property and inventory thereof to court; return and proceedings thereon. – (a) The officer must forthwith deliver the property seized to the judge who issued the warrant, together with a true inventory thereof duly verified under oath.
(b) Ten (10) days after issuance of the search warrant, the issuing judge shall ascertain if the return has been made, and if none, shall summon the person to whom the warrant was issued and require him to explain why no return was made. If the return has been made, the judge shall ascertain whether section 11 of this Rule has been complied with and shall require that the property seized be delivered to him. The judge shall see to it that subsection (a) hereof has been complied with.
(c) The return on the search warrant shall be filed and kept by the custodian of the log book on search warrants who shall enter therein the date of the return, the result, and other actions of the judge.
A violation of this section shall constitute contempt of court.
Sec. 13. Search incident to lawful arrest. – A person lawfully arrested may be searched for dangerous weapons or anything which may have been used or constitute proof in the commission of an offense without a search warrant.
Sec. 14. Motion to quash a search warrant or to suppress evidence; where to file. – A motion to quash a search warrant and/or to suppress evidence obtained thereby may be filed in and acted upon only by the court where the action has been instituted. If no criminal action has been instituted, the motion may be filed in and resolved by the court that issued search warrant. However, if such court failed to resolve the motion and a criminal case is subsequently filed in another court, the motion shall be resolved by the latter court.