Reasonable Doubt and the Chain of Custody Rule in Drug Possession Cases

In a significant ruling on the rights of the accused in drug cases, the Supreme Court, in Mariñas v. People (G.R. No. 232891, July 23, 2018), acquitted a man convicted of illegal possession of shabu. The Court reversed the lower courts' decisions because the prosecution failed to justify the absence of required witnesses during the inventory of the seized drugs. This case underscores a vital principle: the prosecution must prove guilt beyond reasonable doubt, and any substantial gap in the chain of custody of illegal drugs can create the reasonable doubt that warrants an acquittal.

The Facts of the Case

Around 3:00 in the morning on October 5, 2010, police officers in San Pedro, Laguna were conducting a follow-up operation on a reported motorcycle theft. While walking through an alley, they saw Lamberto Mariñas holding a plastic sachet that appeared to contain shabu. When the officers approached and identified themselves, Mariñas tried to flee but was apprehended. Another man, George Hermino, was also arrested inside a nearby house with a plastic sachet of shabu.

The seized items were brought to the police station, where they were marked and inventoried. Only a media representative was present during the inventory; no elected public official or Department of Justice (DOJ) representative was there. Mariñas was charged with violation of Section 11, Article II of Republic Act No. 9165, the Comprehensive Dangerous Drugs Act of 2002. The trial court convicted him, and the Court of Appeals affirmed. Mariñas appealed to the Supreme Court.

The Issue

The central question was whether the Court of Appeals erred in affirming Mariñas's conviction despite the prosecution's failure to comply with the chain of custody requirements under Section 21 of R.A. No. 9165.

The Ruling: Acquittal Due to a Broken Chain

The Supreme Court granted the petition and acquitted Mariñas. To convict a person of illegal possession of dangerous drugs, the prosecution must prove three elements beyond reasonable doubt: (1) the accused was in possession of the drug; (2) such possession was not authorized by law; and (3) the accused was freely and consciously aware of being in possession of it.

Crucially, the prosecution must also prove the identity of the prohibited drug with moral certainty. The drug itself is the corpus delicti of the crime, so the prosecution must show an unbroken chain of custody from seizure to presentation in court. This rule prevents the possibility of switching, planting, or contaminating evidence.

Under the old provisions of Section 21, which applied because the crime was committed before the 2014 amendment by R.A. No. 10640, the inventory and photographing of seized items had to be done in the presence of three witnesses: a representative from the media, a representative from the DOJ, and any elected public official.

In this case, only the media representative was present. The prosecution failed to provide any justifiable ground for the absence of the other two required witnesses. The Court held that this unjustified absence constituted a substantial gap in the chain of custody, casting serious doubt on the integrity and evidentiary value of the seized drugs.

The Court cited People v. Umipang to emphasize that while minor procedural lapses may be excused if properly explained, a gross or deliberate disregard of the procedural safeguards creates uncertainty about the identity of the seized items. This uncertainty cannot be remedied by invoking the presumption of regularity in the performance of official duties. When the prosecution fails to establish the corpus delicti, it fails to prove guilt beyond reasonable doubt.

The Importance of Strict Compliance

The Court noted that the arresting officers were justified in making a warrantless arrest and in marking the seized items at the police station rather than at the place of arrest. The rules allow marking at the nearest police station in warrantless seizures. However, the failure to secure the presence of the required witnesses during the inventory was a separate and fatal flaw.

The ruling reaffirms the constitutional presumption of innocence. The prosecution bears the burden of overcoming this presumption with strong evidence. If it fails to discharge this burden, the accused deserves an acquittal.

Practical Takeaways

• Chain of custody is crucial. In drug cases, the prosecution must account for every link in the chain of custody of the seized drugs, from the moment of seizure to presentation in court.
• Witnesses are mandatory. Under the original Section 21 of R.A. No. 9165, the inventory must be conducted in the presence of a media representative, a DOJ representative, and an elected public official. The 2014 amendment reduced this to two witnesses: an elected public official and either a representative of the National Prosecution Service or the media.
• Non-compliance must be justified. If the required witnesses are absent, the prosecution must prove justifiable grounds for their absence. Merely invoking the presumption of regularity is not enough.
• Reasonable doubt leads to acquittal. A substantial gap in the chain of custody creates reasonable doubt about the identity and integrity of the seized drugs, which can result in the acquittal of the accused.
• The presumption of innocence is paramount. The prosecution must rely on the strength of its own evidence, not on the weakness of the defense.

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