When Alibi Falls Short: The Weight of Credible Eyewitness Testimony in Philippine Criminal Cases

In Philippine criminal procedure, a conviction can rest on the testimony of a single eyewitness—provided that testimony is positive, credible, and consistent. The Supreme Court's 2007 decision in Nerpio v. People (G.R. No. 155153) reaffirms this principle while clarifying the heavy burden a defendant faces when raising the defense of alibi. The case offers practical lessons for both litigants and ordinary citizens about how courts weigh competing versions of events.

The Facts of the Case

On October 3, 1993, SPO1 Loreto Nerpio, a police officer assigned to the SWAT-Intelligence Investigation Division in Caloocan City, hosted a birthday party for his son at his residence. That morning, the victim, Mario Salazar, passed by and joined the drinking session before leaving around two in the afternoon.

Later that day, Nelly Villanueva, who was waiting for a friend along Pita Street, witnessed a man call Salazar twice. When Salazar approached, the man placed his arm around Salazar's shoulder, poked a gun at the right side of his neck, and fired. Salazar slumped against a wall, then attempted to escape, but four men appeared and mauled him. At the corner of Pita and Tindalo Streets, Salazar was shot several more times and died. The autopsy revealed five gunshot wounds—three on the head and two on the body.

During trial, Villanueva positively identified Nerpio as the gunman. The defense presented alibi: Nerpio claimed he never left his house that day until he heard about the shooting involving his cousin and Salazar.

The Legal Issue

The central question before the Supreme Court was whether the Court of Appeals erred in affirming Nerpio's conviction for homicide based solely on the testimony of one eyewitness, and whether the defense of alibi should have been given more weight.

The Court's Ruling

The Supreme Court denied the petition and affirmed the conviction. In doing so, the Court laid down important principles on witness credibility and the defense of alibi.

On witness credibility. The Court reiterated that findings of the trial court on witness credibility are entitled to great respect, since trial judges have the unique opportunity to observe witnesses' demeanor on the stand. A witness who testifies clearly, positively, and convincingly, and who remains consistent on cross-examination, is considered credible.

The Court found that Villanueva's testimony bore these marks. She did not waver when questioned by the prosecutor, the defense counsel, and the court, and she consistently pointed to Nerpio as the offender. While the defense pointed out minor inconsistencies—such as discrepancies about the assailant's profession, the victim's address, and the time of the incident—the Court held these were trivial and immaterial to the elements of the crime. Similarly, differences between Villanueva's sworn affidavit and her court testimony did not undermine her credibility, because affidavits taken ex parte are generally inferior to open-court declarations.

On alibi. The Court emphasized that for alibi to prosper, it is not enough to show that the accused was somewhere else when the crime occurred. The defense must demonstrate that it was physically impossible for the accused to have been at the crime scene or its immediate vicinity during its commission.

This is where Nerpio's defense failed. He admitted that his house was only about 150 meters from the crime scene. He even conceded that he went to the scene after the shooting. The geographical proximity meant it was entirely possible for him to have been present at the time of the killing. The Court noted that alibi has been rejected in cases where the two locations were in the same municipality, easily accessible by public transportation, or reachable within a short walking or driving distance.

On denial. The Court also ruled that denial is a negative, self-serving assertion that cannot prevail over the positive and categorical testimony of a credible witness. Absent any evidence of improper motive on Villanueva's part, her testimony deserved full credit.

Practical Takeaways

• A single credible eyewitness can support a conviction. Philippine law does not require multiple witnesses to prove guilt beyond reasonable doubt. What matters is the quality and credibility of the testimony.
• Minor inconsistencies do not automatically destroy credibility. Courts focus on discrepancies that affect the elements of the crime, not trivial details like addresses or educational background.
• Alibi requires physical impossibility. Merely being at another place is insufficient. The defense must prove that the accused could not have been at the crime scene, considering distance, time, and accessibility.
• Open-court testimony generally outweighs affidavits. Statements given in court, subject to cross-examination, are given more weight than affidavits taken ex parte.
• Proximity matters. The closer the accused's claimed location is to the crime scene, the weaker the alibi defense becomes.

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