G.R. No. 198240 ; July 3, 2013
LUISA NAVARRO MARCOS, Petitioner, vs. THE HEIRS OF THE LATE DR. ANDRES NAVARRO, JR., Respondents.

FACTS

Petitioner Luisa Navarro Marcos and her sister Lydia Navarro Grageda are co-heirs of the late spouses Andres Navarro, Sr. and Concepcion Medina-Navarro, along with the respondents, who are the heirs of their brother, Andres Navarro, Jr. A dispute arose over a 108-hectare lot when respondents claimed exclusive ownership based on an Affidavit of Transfer of Real Property dated 1954, purportedly a donation from Andres, Sr. to Andres, Jr. Believing the signature was forged, the sisters, through a fiscal, requested a PNP handwriting examination. PO2 Mary Grace Alvarez, a handwriting expert, concluded the signature on the affidavit did not match the standard signatures of Andres, Sr. Consequently, the sisters filed an annulment case (Civil Case No. 5215) before the RTC of Masbate.
During pre-trial, respondents moved to disqualify PO2 Alvarez as a witness, arguing the examination was unauthorized and conducted without notice, violating due process. The RTC granted the motion, ruling her testimony would be hearsay and prematurely presented as an expert opinion. The sisters’ petition for certiorari before the CA was dismissed, with the CA initially holding the issue was moot due to the dismissal of the underlying civil case. The CA also refused to take judicial notice of a subsequent decision by another CA Division reinstating Civil Case No. 5215.

ISSUE

Whether the Court of Appeals erred in affirming the Regional Trial Court’s disqualification of PO2 Mary Grace Alvarez as a witness.

RULING

The Supreme Court ruled in favor of the petitioner, reversing the CA and RTC. The Court held that the CA erred in considering the issue moot. While the CA correctly noted the initial dismissal of Civil Case No. 5215, it committed a reversible error by refusing to take judicial notice of the subsequent reinstatement of the same case by another Division of the appellate court. This reinstatement was a subsequent fact crucial to the proceedings and should have been acknowledged.
More critically, the Court found the RTC committed grave abuse of discretion in disqualifying PO2 Alvarez. Grave abuse of discretion exists when a court acts in a capricious or whimsical manner equivalent to a refusal to perform a legal duty. The Rules of Court on witness qualification are explicit. Under Rule 130, Sections 20 to 24, all persons who can perceive and communicate their perception are competent witnesses unless specifically disqualified on grounds such as mental incapacity, marriage, death of the adverse party, or privileged communication. PO2 Alvarez possessed none of these statutory disqualifications. The RTC’s rationale—that her testimony would be hearsay and prematurely offered as expert opinion—was legally flawed. An expert witness, by definition, testifies based on specialized knowledge, not purely personal knowledge of the event. Her opinion on the authenticity of the signature, derived from a technical examination, was precisely the type of evidence permissible under the rules. Disqualifying her outright deprived the petitioner of the opportunity to present crucial evidence central to proving forgery, thereby violating her right to due process. The probative value of her testimony should be determined during trial, not precluded at the pre-trial stage.