Chain of Custody and the Integrity of Drug Evidence: Safeguarding Against Tampering

In drug cases, the prosecution must prove not only that the accused sold illegal drugs, but also that the drugs presented in court are the very same items seized. This is the essence of the chain of custody rule. In People v. Saunar (G.R. No. 207396, August 9, 2017), the Supreme Court acquitted an accused because law enforcers failed to safeguard the integrity of a miniscule amount of shabu. The ruling is a reminder that in drug prosecutions, procedure protects substance.

The Case

Delia Saunar was charged with illegal sale of dangerous drugs under Section 5, Article II of Republic Act No. 9165. A buy-bust team allegedly caught her selling two plastic sachets of shabu to a poseur-buyer. The drugs weighed only 0.0496 grams and 0.0487 grams. The Regional Trial Court convicted Saunar and sentenced her to life imprisonment and a fine of P500,000. The Court of Appeals affirmed. Saunar appealed to the Supreme Court.

The Issue

The sole issue was whether Saunar's guilt was proven beyond reasonable doubt. The accused argued that the police failed to comply with the chain of custody rule, creating gaps in the handling of the seized drugs.

The Ruling

The Supreme Court reversed the conviction and acquitted Saunar. The Court held that the prosecution failed to establish who held the seized items from the moment they were taken from the accused until they reached the police station. The poseur-buyer did not testify on who took custody of the sachets during transit.

The Court also noted several procedural lapses: the seized items were marked only at the police station, not immediately after seizure; no photograph of the seized drugs was taken at the crime scene; the marking and inventory were not shown to have been done in the presence of the accused or her representative; and none of the witnesses to the inventory was presented in court.

Why Strict Compliance Matters

The Court explained that a miniscule amount of dangerous drugs is highly susceptible to planting, tampering, or alteration. Unlike readily identifiable objects, narcotic substances require scientific analysis to determine their nature. There is always a possibility that, at any link in the chain, the substance could have been exchanged, contaminated, or substituted.

Section 21 of R.A. No. 9165, as amended by R.A. No. 10640, requires the apprehending team to conduct a physical inventory and photograph the seized items immediately after seizure, in the presence of the accused or her representative, an elected public official, and a representative of the National Prosecution Service or the media. While strict compliance may be excused under justifiable grounds, the integrity and evidentiary value of the seized items must be preserved.

The Court emphasized that the presumption of regularity in the performance of official duties cannot save a prosecution when there are unexplained gaps in the chain of custody. In drug cases, the prosecution's sweeping guarantees are not enough.

Marking as the Starting Point

While marking is not expressly found in R.A. No. 9165, it is crucial in proving the chain of custody. Marking means placing the apprehending officer's initials or signature on the seized items immediately after seizure. It is the starting point of the custodial link. Belated marking creates doubt on the authenticity of the corpus delicti, because succeeding handlers use the markings as reference.

Practical Takeaways

• In drug cases, the prosecution must prove the identity and integrity of the seized drugs beyond reasonable doubt, not just the fact of the sale.
• Law enforcers must mark seized items immediately after seizure, not later at the police station.
• The physical inventory and photographing of seized items must be done in the presence of the accused or her representative, an elected public official, and a representative of the National Prosecution Service or the media.
• Every person who handled the seized drugs should testify on how and from whom they received the items, and what happened to them while in their custody.
• When only a miniscule amount of drugs is involved, courts apply a more exacting standard because the risk of tampering or planting is greatest.

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