Reasonable Doubt in Drug Cases: Why a Broken Chain of Custody Leads to Acquittal

In a significant ruling that underscores the importance of procedural regularity in drug prosecutions, the Supreme Court acquitted an accused in a drug sale case because the prosecution failed to establish an unbroken chain of custody over the seized illegal drugs. The case of People v. Carlit (G.R. No. 227309, August 16, 2017) serves as a crucial reminder that the presumption of regularity in the performance of official duties cannot replace the prosecution's burden of proving every link in the chain of custody with moral certainty.

The Facts of the Case

On February 26, 2011, PO3 Christian Carvajal acted as a poseur-buyer in a buy-bust operation against Jocelyn Carlit in Dagupan City. The officer claimed that Carlit sold him a sachet of shabu weighing 0.07 grams for P500. The sachet was allegedly marked at the police station, not at the place of arrest. The prosecution presented only two witnesses: the poseur-buyer and the forensic chemist, PSI Myrna Malojo Todeño.

The forensic chemist testified that after examining the specimen, she turned it over to the evidence custodian, PO2 Manuel. However, PO2 Manuel was never presented as a witness. The trial court convicted Carlit, and the Court of Appeals affirmed the conviction. Carlit appealed to the Supreme Court.

The Issue

The central question was whether the prosecution had sufficiently established the chain of custody of the seized drugs to sustain a conviction for illegal sale of dangerous drugs under Section 5 of Republic Act No. 9165 (the Comprehensive Dangerous Drugs Act of 2002).

The Ruling: Acquittal on Reasonable Doubt

The Supreme Court reversed the conviction and acquitted Carlit. The Court held that the prosecution failed to prove every link in the chain of custody, which is essential in drug cases because narcotic substances are "not readily identifiable and prone to tampering, alteration, or substitution."

The Four Links of the Chain

Citing People v. Salvador (G.R. No. 190621, February 10, 2014), the Court enumerated the four links that must be established in a buy-bust situation:

1. Seizure and marking of the illegal drug recovered from the accused by the apprehending officer
2. Turnover of the illegal drug by the apprehending officer to the investigating officer
3. Turnover by the investigating officer to the forensic chemist for laboratory examination
4. Turnover and submission of the marked illegal drug from the forensic chemist to the court

Where the Chain Broke

The Court found that the chain broke at the final link. PO2 Manuel, the evidence custodian who received the specimen from the forensic chemist, was never presented as a witness. The Court emphasized that the threat of tampering, alteration, or substitution exists every time the prohibited item is stored or transported—from the crime laboratory to the court. Without the evidence custodian's testimony, there was no guarantee that the corpus delicti (the body of the crime) had been preserved.

Non-Compliance with Section 21 of RA 9165

The Court also noted that the arresting officers failed to comply with Section 21 of RA 9165, as amended by RA 10640. The law requires that after seizure, the apprehending team must conduct a physical inventory and photograph the seized items in the presence of:

• The accused or his/her representative or counsel
• An elected public official
• A representative of the National Prosecution Service or the media

In this case, the poseur-buyer admitted that he marked the sachet at the police station instead of at the place of arrest. The officers also failed to secure the presence of a media representative or a barangay official during the inventory. No justifiable explanation was offered for these lapses.

The Court reiterated that while non-compliance with Section 21 may be excused, this is only allowed when there are justifiable grounds and the integrity and evidentiary value of the seized items are properly preserved. Here, the prosecution offered no explanation at all.

Practical Takeaways

• Every link matters. The prosecution must present witnesses who can account for the seized drugs at every stage—from seizure to marking, to turnover to the investigating officer, to the forensic chemist, and finally to the court. Missing even one link can result in acquittal.

• Immediate marking is required. The law requires marking of seized items immediately at the place of arrest, not at the police station, unless there are justifiable grounds.

• Witnesses to the inventory are mandatory. The presence of an elected public official and a representative of the National Prosecution Service or the media during the physical inventory is a statutory requirement, not a mere formality.

• The presumption of regularity is not enough. Police officers cannot simply rely on the presumption of regularity in the performance of their duties. The prosecution must prove with moral certainty that the drug presented in court is the same drug confiscated from the accused.

• Non-compliance requires explanation. If the prosecution recognizes procedural lapses, it must explain the justifiable grounds for them and prove that the integrity and evidentiary value of the seized items were preserved despite the lapses.

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