Chain of Custody Breaks Lead to Acquittal in Drug Sale Case

In a significant ruling on the strict requirements of drug prosecution, the Supreme Court acquitted Eduardo Catinguel y Viray of illegal sale of marijuana after finding that police officers failed to establish an unbroken chain of custody over the seized item. The case underscores that in drug offenses, the prosecution must prove not only the sale but also that the drugs presented in court are exactly the same items seized from the accused.

The Case Before the Court

On March 3, 2014, police operatives in Bugallon, Pangasinan conducted a buy-bust operation against Catinguel, who allegedly sold one plastic sachet of marijuana to a poseur-buyer for PHP 100.00. The accused was arrested and charged with violation of Section 5, Article II of Republic Act No. 9165, the Comprehensive Dangerous Drugs Act of 2002.

Both the Regional Trial Court and the Court of Appeals convicted Catinguel, relying on the testimony of the poseur-buyer and the forensic chemist. The accused appealed to the Supreme Court, arguing that the police failed to comply with the chain of custody requirements.

The Chain of Custody Rule

The chain of custody rule is a method of authenticating evidence. As explained in Mallillin v. People, every person who handled the seized item must testify about how and from whom they received it, what happened to it while in their possession, and the precautions taken to prevent tampering or substitution.

The Court identified four critical links that must be established:

1. Seizure and marking of the illegal drug by the apprehending officer
2. Turnover of the drug to the investigating officer
3. Turnover by the investigating officer to the forensic chemist
4. Turnover and submission of the marked drug to the court

Breaks in the Chain

The prosecution failed on all four links. First, the apprehending officer did not mark the seized item at the place of arrest. His excuse — that two or three of the accused's friends were "murmuring" nearby — was deemed flimsy, especially since he was armed and accompanied by another officer.

Second, the required witnesses were not present during inventory and photography. Although a media representative and a DOJ representative were called, no elected public official attended. The police claimed they invited barangay officials by telephone, but the officer admitted he never personally heard the call and did not bother to go to the nearby barangay hall.

Third, the seized item was never properly turned over to the investigating officer. The apprehending officer testified that he merely showed the item to the investigator but kept it in his own hands the entire time. The investigator refused to receive it.

Fourth, the forensic chemist testified she received the item from the apprehending officer, but the officer claimed he handed it to a different person. The evidence custodian who kept the item until trial was never presented in court, and no stipulation was made regarding his handling of the evidence.

Why This Matters

In drug cases, the illegal drug itself is the corpus delicti — the body of the crime. The prosecution must prove with moral certainty that the drugs presented in court are the same drugs seized from the accused. Any break in the chain of custody creates reasonable doubt.

While Section 21 of RA 9165 and its Implementing Rules allow for non-compliance under justifiable grounds, the prosecution must still prove that the integrity and evidentiary value of the seized items were preserved. Here, the prosecution offered no sufficient justification for the multiple deviations.

Practical Takeaways

• Mark items immediately. Seized drugs should be marked at the place of arrest whenever practicable. Vague fears about bystanders are not enough to justify delay.
• Secure all required witnesses. The presence of an elected public official, a media representative, and a DOJ representative during inventory is mandatory. A mere telephone invitation that went unanswered is insufficient.
• Document every transfer. Each turnover of the seized item — from apprehending officer to investigator, to forensic chemist, to evidence custodian, to court — must be properly documented and testified to.
• Present all links in the chain. Police officers, investigators, forensic chemists, and evidence custodians who handled the item should all testify, or the parties should stipulate to their testimony.
• Substantial compliance requires justification. Courts will not automatically excuse deviations from the chain of custody rules; the prosecution must explain any non-compliance and show the evidence remained intact.

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