Credibility of Deaf-Mute Witness Testimony in Rape Cases: Philippine Supreme Court Ruling

The Supreme Court's 2000 decision in People v. Tuangco (G.R. No. 130331) reaffirms a crucial principle in Philippine criminal procedure: a physical disability does not disqualify a person from being a competent witness. The case, which involved the rape and killing of a young bookkeeper in Pampanga, centered on whether the testimony of a deaf-mute eyewitness could support a conviction beyond reasonable doubt. The ruling provides important guidance on how courts evaluate witness credibility, particularly when the witness communicates through sign language.

The Facts of the Case

On the evening of January 3, 1995, Aurea Eugenio, a bookkeeper for the Centro Escolar University Credit Cooperative, alighted from a bus in Apalit, Pampanga, and walked toward her home. She never arrived. The next morning, her naked body was found beside a creek, bearing multiple stab wounds and signs of sexual abuse.

Three men—Adel Tuangco, his brother Sonny Tuangco, and Nelson Pineda Jr.—were charged with rape with homicide and theft. The prosecution's principal witness was Silvestre Sanggalan, a deaf-mute who claimed to have witnessed the entire incident from about three and a half meters away. He testified through sign language, interpreted by Eva Sangco, a certified sign language expert with 22 years of teaching experience at the Philippine School for the Deaf.

The Issue Before the Court

The accused-appellants argued that the trial court gravely erred in giving full faith and credence to Sanggalan's testimony. They contended that because Sanggalan had no formal schooling in a special school for deaf-mutes, his testimony was unreliable. They pointed to alleged inconsistencies, including his admission that the area was "very dark" and confusion over who raped the victim first.

The Ruling: Deaf-Mutes Are Competent Witnesses

The Supreme Court affirmed the conviction, holding that a deaf-mute is not incompetent as a witness. Under Section 20, Rule 130 of the Revised Rules of Court, all persons who can perceive and make known their perceptions to others may be witnesses. The Court established that deaf-mutes are competent witnesses when they meet three conditions:

1. They can understand and appreciate the sanctity of an oath;
2. They can comprehend the facts they are going to testify on; and
3. They can communicate their ideas through a qualified interpreter.

The Court distinguished this case from People v. Bustos, where a deaf-mute's testimony was rejected because the interpreter could not understand the witness's signs. Here, the interpreter was highly qualified, and the trial court carefully evaluated her competence.

Minor Inconsistencies Do Not Destroy Credibility

The Court emphasized that minor inconsistencies in a witness's testimony can actually indicate truthfulness. As established in People v. Mocasa, discrepancies in minor details suggest the testimony is not rehearsed and tend to bolster its probative value. The Court noted that the imperfections cited by the defense arose from the inherent difficulty of eliciting testimony from a deaf-mute witness, but these did not detract from the core of his account.

What mattered most was that Sanggalan knew the accused personally, was with them that night, and positively identified them despite rigorous cross-examination. His testimony was also corroborated by the medico-legal findings of Dr. Dominic Aguda, who testified to the victim's nine stab wounds, fresh hymenal lacerations, and evidence of a hard foreign object inserted into her vaginal canal.

The Defense of Alibi and Flight

The accused's defense of alibi—supported by relatives—failed. The Court reiterated that alibi must yield to positive identification. Moreover, no proof was shown of the physical impossibility of the accused being at the crime scene; the rape-slay location was only ten to fifteen minutes from Adel Tuangco's residence. For Sonny Tuangco, who went into hiding for about a year after his brother's arrest, his flight was taken as an admission of guilt.

Practical Takeaways

• Physical disability is not a bar to testimony. Courts evaluate a witness's capacity to perceive, understand the oath, and communicate—not physical appearance or formal education.
• Qualified interpreters are essential. The competence of the sign language interpreter was critical. Courts will scrutinize whether the interpreter can accurately convey the witness's statements.
• Minor inconsistencies may strengthen credibility. Perfectly consistent testimony can be a sign of rehearsal. Small discrepancies often indicate a truthful, unrehearsed account.
• Alibi is a weak defense against positive identification. For alibi to succeed, the accused must prove physical impossibility of being at the crime scene.
• Flight indicates guilt. Hiding from authorities after learning of an arrest can be treated as an admission of culpability.

The Court affirmed the death penalty for the special complex crime of rape with homicide under Article 335 of the Revised Penal Code, as amended by Republic Act No. 7659, and increased the civil indemnity to P100,000.00. The case remains a landmark on the credibility of witnesses with disabilities in Philippine criminal jurisprudence.

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