Chain of Custody in Drug Cases: Why Witness Credentials Matter

The Supreme Court has reminded trial courts and law enforcers that the presumption of regularity in police work cannot defeat the constitutional right to be presumed innocent. In People v. Flores, the Court acquitted two accused-appellants after finding serious gaps in the chain of custody of seized drugs — particularly the failure to prove the identities and credentials of the required insulating witnesses.

The case underscores a crucial but often overlooked requirement in drug prosecutions: the prosecution must not only present the signatures of witnesses on an inventory form, but must also prove who these witnesses actually are.

The Facts of the Case

On December 12, 2016, police officers from the Novaliches Police Station conducted a buy-bust operation against Gerald Flores, Harrold Francisco, and Louie Truelen in Quezon City. The poseur-buyer purchased one sachet of shabu worth P500. After the transaction, the team arrested all three and recovered several plastic sachets containing methamphetamine hydrochloride.

The arresting officers claimed that they could not conduct the inventory at the place of arrest because bystanders started shouting at them. Instead, they proceeded to the police station, where they conducted the inventory in the presence of two witnesses: Jun Tobias, a media reporter, and Nelson Dela Cruz, a barangay kagawad. Both signed the inventory form.

The Regional Trial Court convicted all three accused. The Court of Appeals affirmed. On appeal, however, the Supreme Court reversed the conviction of Flores and Francisco. (Truelen died in detention, which extinguished his criminal liability.)

The Issue: Were the Insulating Witnesses Properly Proven?

Under Section 21 of Republic Act No. 9165, as amended by R.A. No. 10640, the physical inventory and photographing of seized drugs must be conducted in the presence of the accused or his representative, plus an elected public official and a representative of the National Prosecution Service or the media. These "insulating witnesses" must sign the inventory and receive a copy.

The Supreme Court found several critical flaws in the prosecution's evidence:

First, the Joint Affidavit of Apprehension stated that the buy-bust operation began at 9:00 p.m., yet the Inventory Form also indicated 9:00 p.m. as the time of inventory. This discrepancy was never explained.

Second, the signature of Tobias on the inventory form did not match his signature on his press identification card.

Third, there was no document on record proving that Dela Cruz was actually a barangay kagawad. No commission, appointment paper, or any official document identified him as such.

Fourth, both witnesses took at least 15 minutes to arrive at the police station after being called. The Court noted that the insulating witnesses should be readily available at or near the place of arrest, not summoned after the operation has concluded.

The Presumption of Regularity Cannot Trump Presumption of Innocence

The Court emphasized that the presumption of regularity in the performance of police duties is merely a rule of evidence. It cannot overcome the constitutional presumption of innocence, which requires the prosecution to prove guilt beyond reasonable doubt.

Citing People v. Ordiz, the Court stressed that the burden of proof in criminal cases never shifts. The accused need not present any evidence if the prosecution fails to discharge its burden. In drug cases, this means the prosecution must establish compliance with Section 21 of R.A. No. 9165 — or at least prove justifiable grounds for non-compliance and the preservation of the drugs' integrity.

Why Witness Credentials Are Substantive Requirements

The Court clarified that while Section 21 requires the presence and signatures of insulating witnesses, these substantive requirements cannot be proven without first establishing the witnesses' identities and credentials. A signature on an inventory form is meaningless if the prosecution cannot show that the signatory is who he claims to be.

The Court noted that this issue had been "taken for granted" by trial courts, the Court of Appeals, and even the Supreme Court itself over the years. This case forced the issue open: when the trial court's own questioning revealed the lack of proof of the witnesses' identities, it was error for the court to simply declare that the chain of custody had been fully complied with.

Practical Takeaways

• Police must bring insulating witnesses to the arrest scene or have them readily available nearby. Calling witnesses only after the operation ends defeats the purpose of Section 21, which is to protect against planting or contamination of evidence.
• Prosecutors must present evidence of the insulating witnesses' identities and credentials. A press ID, an official commission, or sworn testimony establishing their positions is necessary — not just their signatures on an inventory form.
• Defense counsel should scrutinize the inventory form for discrepancies. Inconsistencies in time, signatures, or witness identities can create reasonable doubt sufficient for acquittal.
• Trial courts must discuss evidentiary gaps even if not raised by the defense. The Court held that a trial court's pro forma declaration of compliance, despite its own questions revealing deficiencies, is "sheer error."
• The presumption of regularity is not a substitute for proof. In drug cases, the prosecution must affirmatively establish every link in the chain of custody, including the presence of credible insulating witnesses.

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