G.R. No. L-25300. January 4, 1974.
IN RE: APPLICATION FOR PHILIPPINE CITIZENSHIP OF CHAN TECK LAO. CHAN TECK LAO, petitioner-appellant, vs. REPUBLIC OF THE PHILIPPINES, oppositor-appellant.

FACTS

Chan Teck Lao’s application for naturalization was initially denied by the lower court in 1949. On appeal, the Supreme Court reversed this denial in a 1950 decision, leading to the grant of his citizenship and the issuance of his certificate of naturalization in 1952. More than a decade later, in 1962, the Republic filed a petition to cancel his certificate. The sole ground was a purported jurisdictional defect: the failure to present positive evidence during the original 1949 proceedings that the newspaper “Nueva Era,” where his petition was published, was of general circulation in Tarlac, his province of residence.
The lower court, in a 1965 decision, ordered the cancellation of the certificate. It relied on the 1964 ruling in Tan Ten Koc v. Republic, which, for the first time, imposed the requirement for an applicant to present such positive proof of a newspaper’s general circulation. The lower court considered this failure fatal to its jurisdiction, notwithstanding the final and executory 1950 Supreme Court decision in Chan Teck Lao’s favor.

ISSUE

Whether the 1964 Tan Ten Koc ruling, which established a new procedural requirement for naturalization applications, can be applied retroactively to invalidate a final grant of citizenship made in 1950.

RULING

No. The Supreme Court reversed the lower court’s decision and reinstated Chan Teck Lao’s citizenship. The Court anchored its ruling on the principle of non-retroactivity of judicial decisions, as firmly established in Gan Tsitung v. Republic (1967). The legal logic is clear: a new judicial doctrine should not be applied retroactively to impose a requirement that did not exist at the time of the original proceeding, especially when it would nullify a final judgment. To do so would be manifestly unfair and unjust.
Applying the Tan Ten Koc requirement retroactively to Chan Teck Lao’s case would disregard the finality of the 1950 Supreme Court judgment that conclusively determined his eligibility. The Court emphasized the gravity of denaturalization, noting that citizenship, once conferred, carries a status that should not be lightly revoked. The government bears a heavy burden of proof in such proceedings. The 1950 decision in favor of Chan Teck Lao had long become final and vested; his status as a Filipino for over thirteen years deserved protection. The subsequent imposition of a new procedural rule could not retroactively deprive him of a right validly acquired under the law as it stood at the time of his application and final judgment.