Chain of Custody in Drug Cases

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SUBJECT: Chain of Custody in Drug Cases

I. INTRODUCTION
The chain of custody refers to the duly recorded authorized movements and custody of seized dangerous drugs from the time of confiscation until their presentation in court. In Philippine criminal procedure, particularly in drug-related cases under Republic Act No. 9165 (The Comprehensive Dangerous Drugs Act of 2002), establishing an unbroken chain of custody is a critical procedural safeguard. It is essential to ensure the integrity and evidentiary value of the seized items, as the drugs themselves are the very corpus delicti of the offense. Any break or irregularity in this chain can lead to the evidence being rendered inadmissible, potentially resulting in the acquittal of the accused.
II. LEGAL BASIS
The primary legal basis is Section 21 of Republic Act No. 9165, as amended by Republic Act No. 10640. This section mandates the strict procedure for the custody and disposition of confiscated, seized, and/or surrendered dangerous drugs, plant sources of dangerous drugs, controlled precursors and essential chemicals, instruments/paraphernalia and/or laboratory equipment. The law outlines the requirements for immediate physical inventory and photographing of the seized items in the presence of specific witnesses, and the subsequent handling by responsible officers.
III. THE FOUR LINKS IN THE CHAIN OF CUSTODY
Jurisprudence has established that the chain of custody has four crucial links:

Seizure and Marking: The marking of the seized items by the apprehending officer immediately upon confiscation. This is the first link and serves to distinguish the evidence from all other articles.

Turnover to the Investigating Officer: The transfer of the seized item from the apprehending officer to the investigating officer.

Turnover to the Forensic Chemist: The delivery of the item by the investigating officer to the forensic laboratory for examination.

Presentation in Court: The submission and identification of the item by the forensic chemist in court.

IV. THE WITNESS REQUIREMENT UNDER SECTION 21
During the physical inventory and photographing of the seized items, the law requires the presence of the accused or the person from whom the items were seized, or his/her representative or counsel, a representative from the media, a representative from the Department of Justice (DOJ), and an elected public official. These witnesses must be present to ensure the integrity of the procedure and to prevent planting, switching, or contamination of evidence.
V. THE SAVING CLAUSE: JUSTIFIED GROUNDS FOR NON-COMPLIANCE
Strict compliance with Section 21 is required. However, the law provides a saving mechanism. Non-compliance is not fatal if the prosecution proves that:

There was a justifiable ground for the non-compliance; and

The integrity and evidentiary value of the seized items are properly preserved.

The prosecution must positively explain the lapse. Grounds such as “honest mistake,” “justifiable logistical constraints,” or genuine threats to officer safety may be invoked, but they must be clearly proven and must not stem from negligence or bad faith.
VI. CONSEQUENCES OF BROKEN CHAIN OF CUSTODY
Failure to establish an unbroken chain of custody, without a valid justification under the saving clause, creates reasonable doubt on the identity and integrity of the corpus delicti. When the evidence presented is compromised, the presumption of regularity in the performance of official duty cannot prevail over the constitutional presumption of innocence. Consequently, the accused must be acquitted.
VII. BURDEN OF PROOF
The burden lies with the prosecution to prove with moral certainty the identity of the prohibited drug. This includes accounting for each link in the chain of custody. The prosecution must demonstrate that every person who handled the evidence did so in accordance with prescribed procedures and that the item presented in court is the very same item seized from the accused.
VIII. RELATED JURISPRUDENCE

People v. Lim, G.R. No. 231989, September 4, 2018: Emphasized that the marking of seized items is vital as it is the starting point in the chain of custody. Failure to immediately mark the items at the place of seizure casts doubt on their integrity.

People v. Miranda, G.R. No. 229671, January 31, 2018: Highlighted that the presence of the required insulating witnesses at the time of inventory is crucial. Their absence must be justified under the saving clause to preserve the evidence’s integrity.

Mallillin v. People, G.R. No. 172953, April 30, 2008: A foundational case establishing the four links in the chain of custody and ruling that any gap or missing link raises doubt about the authenticity of the evidence presented.

People v. Holgado, G.R. No. 207992, August 11, 2014: Stressed that the prosecution’s failure to offer any justification for procedural lapses under Section 21 warrants the acquittal of the accused, as the integrity of the evidence is compromised.

People v. Hementiza, G.R. No. 227398, March 22, 2017: Clarified that while the saving clause allows for non-compliance, the prosecution must positively acknowledge the lapse and provide a credible, convincing reason for it; mere statements of “presumed regularity” are insufficient.