The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches
and seizures, shall not be violated, and no warrants shall issue, but upon probable cause, supported by oath or
affirmation, and particularly describing the place to be searched, and the persons or things to be seized.

The 1967 case Harry S. Stonehill, et al. v. Hon. Jose W. Diokno, et al. (G.R. No. L-19550) is a landmark Philippine Supreme Court decision that firmly established the doctrine of exclusion, which holds that evidence obtained through illegal searches and seizures cannot be used in court.

In this case, the petitioners challenged the validity of search warrants issued against them on the grounds that the warrants were general in nature, failing to specify what property or documents were to be seized. The Supreme Court struck down the warrants as unconstitutional, affirming that the right to privacy and security of individuals—protected under Section 1(3), Article III of the 1935 Constitution (now echoed in the 1987 Constitution)—must not be violated.

Justice Concepcion’s opinion for the Court underscored that no matter how damning the evidence, it cannot justify disregard for constitutional guarantees. The ruling not only invalidated the seized evidence but also introduced into Philippine jurisprudence the exclusionary principle:

“the fruits of the poisonous tree"

are inadmissible, ensuring that constitutional rights are meaningful rather than merely symbolic.

In essence, Stonehill v. Diokno became a cornerstone in the protection of civil liberties, reinforcing that due process outweighs expediency, and that justice must rest on lawful foundations.

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