Two Broken Links in the Chain of Custody Led to an Acquittal: People v. Sario Explained

This case applies the chain-of-custody requirement under the Comprehensive Dangerous Drugs Act. Read the statute itself: RA 9165 — full text, annotation and interpreting cases.

What the Court Actually Held

Antonio Sario y Serrano was convicted by Branch 36 of the Regional Trial Court of Calamba City, Laguna, in two cases arising from a single buy-bust operation — one for sale and one for possession of shabu. The Court of Appeals affirmed. On ordinary appeal, in a decision penned by Associate Justice Ricardo R. Rosario, the Supreme Court granted the appeal, reversed the conviction, acquitted Sario and ordered him released unless lawfully held for some other cause.

The Court began by disposing of most of the defence’s arguments, expressly adopting the Court of Appeals’ reasoning that the early stages had been properly handled. The poseur-buyer marked the sachet bought as “AS-BB” and the two sachets recovered as “AS1” and “AS2”, and inventoried and photographed them at the scene in the presence of the accused, a barangay kagawad and a media representative. On the face of it, that is a textbook first link.

The convictions failed on the third and fourth links.

The third link. The seized items were delivered to the Regional Crime Laboratory, where they were received by an officer identified in the records as PO3 Villela. The prosecution never called him. With no testimony from the person who took custody, there was nothing on record establishing the condition of the specimens when he received them, or what precautions he took to keep them from being contaminated, altered or switched before the forensic chemist retrieved them for examination. Following People v. Hernandez, the Court treated that silence as a fatal break rather than a technicality, refusing to speculate about what the missing witness would have said.

The fourth link. The only evidence on the final stretch — from the chemist’s examination to the presentation of the drugs in court — was the parties’ stipulation as to the forensic chemist’s testimony. The Court reproduced what that stipulation actually covered: her qualifications, her receipt of the requests for laboratory examination, her qualitative examination, the positive result, her chemistry reports, and her lack of personal knowledge of how the items were recovered. What it did not cover was how she handled, stored or preserved the specimens afterwards. Citing People v. Supat, the Court held that a stipulation that does not reach the manner of handling does not prove the manner of handling.

Because the drugs are themselves the corpus delicti, gaps of this kind make the item presented in court unreliable as proof, and acquittal follows.

What Changed, and What Didn’t

No doctrine was rewritten here. The four links have been settled law for years, and Hernandez, Supat and Sanchez all predate this case. What Sario supplies is a clean, recent illustration of two failures that are extremely common in practice and are often waved through.

The first is treating delivery to the crime laboratory as a formality. A receiving officer who signs for the specimen becomes a custodian, and a custodian whose account is missing is a hole in the chain — not a detail that can be inferred from the fact that the chemist later examined something.

The second, and the more practically important, is the routine stipulation on the forensic chemist. Defence counsel are frequently invited to stipulate in order to dispense with the chemist’s appearance, and the stipulation is usually drafted around the result of the examination. Sario confirms that such a stipulation, however convenient, leaves the fourth link unproven — and that the burden of that gap falls on the prosecution, not the accused.

Who This Affects

Most directly, anyone charged under RA 9165 on the strength of a buy-bust. The decision is a reminder that a case can be unwinnable at the scene and still be lost in the laboratory, and that the defence’s attention should not stop at the marking and inventory.

It matters just as much to families of the accused, who often assume that a positive laboratory result ends the matter. It does not. The result proves what the substance was; it does not prove that the substance examined is the substance taken from the accused. That connection has to be shown link by link, and the State carries the responsibility for explaining any lapse.

One limit deserves emphasis. This is not authority that any imperfection in a drugs case produces an acquittal. The Court expressly rejected the rest of Sario’s arguments. Two specific, identifiable custodial gaps carried the day — not a general complaint about police procedure.

What It Means in Practice

• Ask who received the specimen at the crime laboratory, and whether that person testified. An unpresented receiving officer breaks the third link, and the gap cannot be filled by inference.
• Read any proposed stipulation on the forensic chemist with care. If it covers only qualifications, receipt, examination and result, it leaves the fourth link unproven — and that is the prosecution’s problem, not yours.
• The chain does not end at the laboratory. How the specimen was stored and preserved after examination and before it was offered in court is part of what must be shown.
• The seized drug is the corpus delicti. Where its identity and integrity are genuinely in doubt, the remedy is acquittal on reasonable doubt, not a lighter penalty.
• Raise custodial gaps specifically and on the record. Generalised objections to the conduct of a buy-bust were not what succeeded here.

This commentary is for general informational purposes only and does not constitute legal advice. For guidance specific to your situation, please consult a licensed attorney.

If you or a family member is facing charges under RA 9165, our firm is available to help. You may reach us via Viber or WhatsApp, call us at 0995 433 5550, or send an email to vivasnobles@gmail.com.