Chain of Custody Rule in Drug Cases: Why Witness Presence Matters

The Supreme Court has repeatedly emphasized that in drug cases, the prosecution must do more than prove the accused sold or possessed illegal drugs. It must also prove that the seized items presented in court are exactly the same items taken from the accused. This is the essence of the chain of custody rule under Section 21 of Republic Act No. 9165, the Comprehensive Dangerous Drugs Act of 2002.

In People v. Mendoza y Magno (G.R. No. 225061, October 10, 2018), the Court acquitted an accused because the police failed to secure the presence of a required witness during the physical inventory of seized shabu. The case serves as a clear reminder to law enforcers and prosecutors that strict compliance with the rule is not optional.

The Facts of the Case

On April 4, 2013, police officers conducted a buy-bust operation against Jomar Mendoza in Aguilar, Pangasinan. SPO1 Jimmy Vaquilar acted as the poseur-buyer and purchased a plastic sachet of shabu from Mendoza for P300. After the arrest, the officer searched Mendoza and recovered another sachet. Both sachets were marked on site.

The police prepared a confiscation receipt in the presence of a Barangay Kagawad, then brought the items to the police station for documentation and photographing. The items were later delivered to the crime laboratory, where the forensic chemist confirmed they contained methamphetamine hydrochloride, or shabu.

Mendoza was charged with illegal sale and illegal possession of dangerous drugs. The Regional Trial Court convicted him, and the Court of Appeals affirmed. On appeal, the Supreme Court reversed and acquitted him.

The Issue

The central question was whether the prosecution had proven Mendoza's guilt beyond reasonable doubt, particularly whether it had complied with the chain of custody rule under Section 21 of RA 9165.

The Chain of Custody Rule

Section 21 of RA 9165, as amended by Republic Act No. 10640, requires that after seizure, the apprehending team must conduct a physical inventory and photograph the seized items in the presence of:

1. The accused, or the person from whom the items were seized, or his representative or counsel;
2. An elected public official; and
3. A representative of the National Prosecution Service or the media.

These witnesses must sign copies of the inventory and receive copies. The rule exists to guard against the unlawful planting of evidence and to remove any taint of irregularity in the arrest, as the Court explained in People v. Ocampo (G.R. No. 232300, August 1, 2018).

The Prosecution's Failure

In this case, no representative of the National Prosecution Service or the media was present during the physical inventory. No such representative signed the inventory receipt. Worse, SPO1 Vaquilar admitted that no photograph was taken of the seized items at the place of arrest because it was already 6:30 in the evening.

When asked why no media representative was present, the officer said the team wanted to keep the operation secret. The Court rejected this justification. The confidential nature of a buy-bust operation is not a valid reason to exclude required witnesses from the inventory. The police could have contacted a media representative or a prosecutor after the arrest, without revealing the operation's details in advance.

No Justification in Sworn Statements

The Court also noted that the police did not state any justification for the absence of the required witnesses in their sworn affidavit or other official statements. Under the Chain of Custody Implementing Rules and Regulations, any explanation for noncompliance must be clearly stated in the apprehending officers' sworn statements, along with the steps taken to preserve the integrity of the seized items.

Following the guidelines in People v. Lim (G.R. No. 231989, September 4, 2018), the Court held that the prosecution's failure to comply with the three-witness rule, without any adequate explanation, warranted acquittal based on reasonable doubt.

Practical Takeaways

• The three-witness rule is mandatory. Police must secure the presence of the accused (or counsel), an elected official, and a representative of the National Prosecution Service or media during the physical inventory and photographing of seized drugs.
• Secrecy is not an excuse. The confidential nature of a buy-bust operation does not justify skipping required witnesses. Officers may call witnesses after the arrest, before the inventory.
• Documentation must be complete. Photographs of the seized items, signed inventory receipts, and sworn statements explaining any deviation from the rule are essential to preserve the case.
• Prosecutors must scrutinize compliance. If the sworn statements do not explain noncompliance, the case should not be filed, or the court may dismiss it for lack of probable cause.
• The rule protects the innocent. The chain of custody requirement safeguards against planted evidence and ensures that the drugs presented in court are truly the ones seized from the accused.

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