Invalid Search Warrants: Protecting Rights Against Unreasonable Seizures

The Supreme Court has reaffirmed that the constitutional right against unreasonable searches and seizures is not a mere technicality. In Mendoza v. People (G.R. No. 248350, December 5, 2022), the Court acquitted a man convicted of illegal drug possession because the search warrant used by police was void — it covered two separate offenses, violating the "one-specific-offense rule." The ruling also clarifies that even if a person waives objections to an illegal arrest, the inadmissibility of evidence seized during that arrest remains.

The Facts of the Case

On April 15, 2016, police operatives in Makati City implemented Search Warrant SW-16-288-MN against a certain Jay Tan for violations of the Comprehensive Dangerous Drugs Act (RA 9165) and the Comprehensive Firearms and Ammunitions Regulation Act (RA 10591). The warrant was issued by a judge in Malabon City.

The police broke into the house and found Joemarie Mendoza sitting on the floor of a room, holding a pen gun, with a plastic sachet of shabu and two improvised tooters in front of him. He was arrested on the spot. The operatives also broke open a vault and found guns, ammunition, more drugs, and other items. Mendoza was charged with illegal possession of dangerous drugs and drug paraphernalia under Sections 11 and 12, Article II of RA 9165.

The Regional Trial Court convicted him, and the Court of Appeals affirmed. Mendoza appealed to the Supreme Court.

The One-Specific-Offense Rule

The Supreme Court ruled that the search warrant was void because it authorized a search for evidence of two separate offenses: violation of RA 9165 and violation of RA 10591.

Section 4, Rule 126 of the Revised Rules of Criminal Procedure requires that a search warrant issue only upon probable cause in connection with one specific offense. This rule, rooted in Section 2, Article III of the 1987 Constitution, prevents the issuance of warrants that allow police to search for anything related to any crime. The Court's decision explains that this requirement ensures each warrant is founded on probable cause relating to a single offense, serving as a safeguard against unreasonable searches and seizures.

The Court cited Vallejo v. Court of Appeals and Tambasen v. People to emphasize that a warrant covering more than one offense is totally null and void. The Court also rejected the government's argument that the warrant's "valid" portions could be severed from the invalid ones. Unlike People v. Salanguit, where severability applied to an objectionable item in the list of things to be seized, here the defect went to the very offenses covered by the warrant.

Who Can Question a Search Warrant?

The government argued that Mendoza could not question the warrant because it was issued against Jay Tan, not against him. The Court disagreed.

Citing Securities and Exchange Commission v. Mendoza, the Court held that a person need not be a party to the search warrant proceeding to question its validity. Mendoza's rights were directly impaired — the police could not have entered the room where he was found without the warrant that lent apparent authority to their intrusion. The validity of the warrant was "intimately linked" to his arrest and the seizure of evidence against him.

The Plain View Doctrine Does Not Apply

The Court also ruled that the plain view doctrine could not save the seizure. For this doctrine to apply, the police must have a prior lawful justification for being in the position where they saw the evidence.

Here, the police had no lawful justification — they were in the premises only because of an invalid warrant. Had the warrant been valid, they might have been lawfully present. But because it was void, their presence was illegal, and the discovery of the drugs and paraphernalia was not inadvertent in the lawful sense required by the doctrine.

Waiver of Arrest Does Not Waive Evidence Objections

The Court acknowledged that Mendoza had waived his right to question the legality of his arrest by not raising it before arraignment. However, citing Dominguez v. People and Homar v. People, the Court stressed that this waiver only affects the court's jurisdiction over the person. It does not carry with it a waiver of the inadmissibility of evidence seized during an illegal search.

As the Court put it: "What cannot be done directly cannot likewise be done indirectly." Allowing the evidence would effectively license authorities to violate constitutional rights.

The Chain of Custody Rule Was Also Violated

Even if the warrant had been valid, the Court found a separate ground for acquittal: the police failed to comply with Section 21 of RA 9165, as amended by RA 10640.

The law requires that the physical inventory and photography of seized drugs be conducted in the presence of the accused (or his representative or counsel) and an elected public official plus a representative of the National Prosecution Service or the media. These witnesses must sign the inventory and receive a copy.

In this case, no media representative or National Prosecution Service representative was present. The prosecution offered no explanation for this non-compliance. The Court noted that the police had ample time to arrange for witnesses — they had time to apply for a search warrant. Because the chain of custody was broken, the identity and integrity of the corpus delicti were not established with moral certainty.

Practical Takeaways

• A search warrant must cover only one specific offense. A warrant that lists two or more offenses is void, and all evidence seized under it is inadmissible.
• Third parties can challenge an invalid warrant. If a person's rights are impaired by the implementation of a warrant, that person may question its validity even if the warrant was issued against someone else.
• Waiving an illegal arrest does not waive evidence objections. Submitting to arraignment cures the arrest's defect but does not make illegally seized evidence admissible.
• The plain view doctrine requires a lawful presence. Police cannot rely on plain view if their presence in the premises stems from an invalid warrant.
• Chain of custody compliance is strict. In drug cases, the presence of required witnesses during inventory is mandatory unless the prosecution explains genuine efforts to secure them.

This article is general information and not legal advice. For your specific situation, consult a lawyer or ask ASG Legal AI.