Ensuring Chain of Custody: Safeguarding Drug Evidence in Philippine Law

In drug prosecutions under Republic Act No. 9165, the Comprehensive Dangerous Drugs Act of 2002, the prosecution's case often stands or falls on the integrity of the seized drugs. The Supreme Court has consistently held that what matters most is not perfect compliance with every procedural rule but the preservation of the evidence's integrity and evidentiary value. The 2016 case of People v. Ando (G.R. No. 212632) illustrates this principle, clarifying when lapses in the chain of custody are excusable and when they are fatal.

The Facts of the Case

On 4 October 2006, an informant reported to the Quezon City Anti-Drug Abuse Council that a certain "Ben" was selling shabu in Barangay Culiat, Quezon City. A buy-bust team was formed, with PO1 Vargas designated as the poseur-buyer and provided with a P500.00 marked bill.

At around 4:00 a.m., the team proceeded to the target area. PO1 Vargas and the informant approached the house, where alias Ben—later identified as Den Ando—asked how much shabu she needed. After she handed over the marked money, Den's wife, Sarah Ando, took a small plastic sachet from her bra and gave it to the poseur-buyer. The pre-arranged signal was given, the team moved in, and both accused were arrested. The sachet, marked "PV-10-04-06," tested positive for 0.15 gram of methamphetamine hydrochloride.

The accused denied the charges, claiming they were at home with their children when police barged in and later demanded P50,000.00 for their release. Both the Regional Trial Court and the Court of Appeals found them guilty of illegal sale of dangerous drugs under Section 5, Article II of R.A. No. 9165, sentencing them to life imprisonment and a fine of P500,000.00 each.

The Issue: Non-Compliance with Section 21

On appeal, the accused argued that the police failed to comply with Section 21, Article II of R.A. No. 9165. Specifically, they claimed that no prior surveillance was conducted, no representative from the media, the Department of Justice, or an elective public official was present during the inventory, and the marking of the seized item was not done at the scene of the crime.

The Ruling: Substantial Compliance Is Enough

The Supreme Court affirmed the conviction, holding that the alleged non-compliance with Section 21 was not fatal. The Court emphasized that the apprehending team properly preserved the integrity and evidentiary value of the seized drugs.

On prior surveillance: The Court cited People v. Ganguso (320 Phil. 324 [1995]) in ruling that prior surveillance is not a prerequisite for the validity of an entrapment operation, especially when the buy-bust team was accompanied by their informant.

On the place of marking and inventory: Citing People v. Sanchez (590 Phil. 214 [2008]), the Court noted that in warrantless seizures, the physical inventory and photograph may be conducted at the nearest police station or office of the apprehending team, whichever is practicable. There is no rule that the arrest becomes invalid or the evidence inadmissible simply because marking was not done at the place of arrest.

On the absent witnesses: The Court accepted the explanation of PO1 Vargas that the police tried to secure the coordination of barangay officials, but they refused to sign any document. The accused were present during the inventory.

The Chain of Custody Rule

The Court reiterated the controlling principle: what is of utmost importance is the preservation of the integrity and evidentiary value of the seized items. To be admissible, the prosecution must present through records or testimony the whereabouts of the dangerous drugs from the time of seizure, through turnover to the investigating officer, to the laboratory examination, and up to the time the evidence is offered in court.

As long as the chain of custody remains unbroken, even procedural lapses under Section 21 will not affect the accused's guilt. The Court cited People v. Manlangit (654 Phil. 427 [2011]) and related cases in affirming that substantial compliance with the legal requirements on the handling of seized items is sufficient.

The integrity of the evidence is presumed preserved unless there is a showing of bad faith, ill will, or proof that the evidence has been tampered with. The accused bears the burden of overcoming this presumption. In this case, the accused's bare claim of frame-up, without any plausible reason why the police would single them out, failed to rebut the presumption of regularity in the performance of official duty.

Practical Takeaways

• Preserve the chain of custody above all. Even if the police fail to strictly follow Section 21, the evidence remains admissible as long as its integrity and evidentiary value are shown to have been preserved.
• Explain lapses with justifiable grounds. Courts accept non-compliance when the prosecution provides a reasonable explanation, such as the refusal of barangay officials to sign the inventory.
• Marking may be done off-site. In warrantless seizures, the physical inventory and photograph may be conducted at the nearest police station or office of the apprehending team, whichever is practicable.
• Prior surveillance is not mandatory. A buy-bust operation is valid even without prior surveillance, particularly when the team is accompanied by an informant.
• The defense must show tampering or ill motive. To overcome the presumption of regularity, the accused must present clear and convincing evidence of bad faith, improper motive, or tampering with the seized drugs.

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