Medical Certificate Authentication: Proving Physical Injuries in Philippine Courts

The Supreme Court's ruling in Postanes v. People clarifies a fundamental rule of Philippine evidence law: a medical certificate, no matter how relevant, carries no probative weight unless properly authenticated. For litigants in criminal cases involving physical injuries, this case is a reminder that proper documentation can make or break a claim.

The Case at a Glance

The case arose from two consolidated criminal cases involving charges and countercharges of slight physical injuries between Edgardo Postanes and Remigio Pasion. The Metropolitan Trial Court (MTC) initially convicted Postanes, and this decision was affirmed by both the Regional Trial Court (RTC) and the Court of Appeals (CA).

Postanes appealed to the Supreme Court, alleging that the CA unfairly discriminated against him by admitting Pasion's medical certificate while rejecting his own. The central issue was whether the medical certificates presented by both parties were admissible, given that neither issuing physician testified to authenticate their contents.

Why Authentication Matters

Philippine law requires that private documents, such as medical certificates, be authenticated to establish their genuineness and due execution. This is generally achieved through the testimony of the person who executed the document, or someone familiar with their handwriting or signature.

In this case, the courts admitted Pasion's certificate because it was authenticated by the records custodian from the Philippine General Hospital, who testified to its genuineness. Postanes's certificate lacked such validation—no witness testified to its authenticity or verified its contents. The contrast highlights a critical aspect of evidence law: documents used to prove physical injuries must undergo authentication to be considered credible by the courts.

The Supreme Court's Ruling

The Supreme Court affirmed the lower courts' rulings, emphasizing the importance of adhering to the rules of evidence. The absence of authentication rendered Postanes's medical certificate without probative value, justifying its exclusion.

The Court also reiterated that factual and credibility issues are not appropriate for a petition for certiorari under Rule 45 of the Rules of Court, which allows only questions of law to be raised. Because Postanes was essentially contesting factual findings and the assessment of witness credibility, the Court found no basis to overturn the appellate court's decision. Absent a showing of grave abuse of discretion, the factual findings of the trial court, as affirmed by the Court of Appeals, are generally binding and conclusive.

Practical Takeaways

• Authentication is non-negotiable. A medical certificate must be authenticated—typically by the issuing physician or the records custodian—to be admissible as evidence.
• Understand the authentication options. Authentication can be established through the testimony of the person who executed the document, a witness to its execution, or someone familiar with the signature or handwriting.
• Know the appellate limits. Under Rule 45, the Supreme Court reviews only questions of law, not factual findings or credibility assessments made by lower courts.
• Prepare evidence properly. Parties should prioritize presenting evidence in a manner that complies with legal standards to effectively support their claims and defenses.
• Seek guidance early. Evidentiary rules can be technical; consulting counsel before trial can prevent costly mistakes.

The Postanes case reinforces the need for careful attention to evidentiary rules in Philippine legal practice. Proper authentication is paramount for establishing the credibility of documentary evidence and, ultimately, influencing the outcome of a case.

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