Peru's Constitutional Court (Tribunal Constitucional, TC) has overturned the 15-year prison sentence imposed on former President Ollanta Humala, ordering that the criminal investigation against him be archived. The ruling, published on July 31, 2026, in the official government gazette El Peruano, annuls the entire criminal process that led to his conviction earlier this year. (El Peruano)

The TC declared Humala's habeas corpus petition "fundada" — founded, or upheld — having accredited that the principles of legality in the criminal process were violated. By granting the habeas corpus, the court did not merely vacate the sentence but invalidated the procedural framework underpinning the conviction, directing that the investigation be closed rather than remanded for retrial. (Deutsche Welle)

The original 15-year sentence was handed down by the Tercer Juzgado Penal Colegiado Nacional (Third National Collegiate Criminal Court) on April 15, 2026. That court had convicted Humala in connection with a corruption case, placing him among several former Peruvian presidents facing or serving sentences related to graft allegations. The TC's intervention now removes that conviction from the legal record. (El Peruano)

The order to archive the investigation is particularly consequential. It distinguishes the TC's ruling from a conventional appellate reversal, which would typically allow prosecutors to retry the case. By directing that the file be closed, the Constitutional Court forecloses further judicial pursuit of the matter within the scope of the original case. (Panamericana)

The TC's legal reasoning centered on the principle of legality — the doctrine that criminal liability and punishment must rest on clearly established law applied through procedurally sound processes. The court found that this principle had been violated during Humala's prosecution, though the full detail of which specific procedural defects triggered the finding is contained in the court's published resolution. Habeas corpus in Peru functions not only as a protection against unlawful detention but, as deployed here, as a constitutional mechanism to challenge the integrity of criminal proceedings themselves. The TC's use of this remedy to vacate a completed conviction, rather than to prevent an imminent deprivation of liberty, illustrates the broad scope the court affords the writ.

Peru's constitutional jurisprudence has occasionally placed the TC at odds with the ordinary judiciary, particularly when constitutional remedies are used to unwind criminal convictions. The tension reflects a structural feature of Peru's legal system, where the Constitutional Court operates as the ultimate interpreter of constitutional rights while the National Collegiate Criminal Courts exercise jurisdiction over serious offenses. When the TC finds that constitutional principles were violated in a criminal process, its rulings bind lower courts and can nullify their output entirely.

The ruling also intersects with a broader pattern of judicial proceedings against former Peruvian heads of state. Humala was convicted alongside a cohort of ex-presidents caught in various stages of the justice system. The TC's decision to void his conviction and archive the case narrows that cohort by one, though the legal situation of the others remains governed by their own distinct proceedings.

The wider stakes involve the relationship between Peru's anti-corruption apparatus and its constitutional judiciary. When the Constitutional Court annuls a corruption conviction on legality grounds, it raises the question of whether the problem lies in the conduct of individual prosecutors and judges, or in structural features of how these cases are built. The distinction matters: isolated procedural errors can be corrected on retrial, but if the TC's reasoning points to systemic defects in the prosecution of corruption cases, the implications extend well beyond Humala. Among the issues worth watching is whether prosecutors attempt to pursue the matter through alternative legal avenues despite the archive order, or whether the ruling triggers broader review of pending corruption cases that share procedural similarities with Humala's.

The decision is final under Peru's constitutional framework. The TC is the court of last resort for constitutional matters, and no further appeal lies within the domestic legal system.