Summary

William J. Brennan, Jr. Kaufman v. United States — Opinion of the Court

More fundamentally, the logic of his dissent cannot be limited to the availability of post-conviction relief. It brings into question the propriety of the exclusionary rule itself. The application of that rule is not made to turn on the existence of a possibility of innocence; rather, exclusion of illegally obtained evidence is deemed necessary to protect the right of all citizens, not merely the citizen on trial, to be secure against unreasonable searches and seizures.
Source: Wikisource

William J. Brennan, Jr. Kaufman v. United States — Opinion of the Court

Plainly the interest in finality is the same with regard to both federal and state prisoners. With regard to both, Congress has determined that the full protection of their constitutional rights requires the availability of a mechanism for collateral attack. The right then is not merely to a federal forum but to full and fair consideration of constitutional claims. Federal prisoners are no less entitled to such consideration than are state prisoners.
Source: Wikisource

William J. Brennan, Jr. Kaufman v. United States — Opinion of the Court

What if new law has been made or facts uncovered relating to the constitutional claim since the trial and appeal? What if the trial or appellate court based its rulings on findings of fact made after a hearing not 'full and fair' within the meaning of Townsend v. Sain, 372 U.S. 293, 83 S.Ct. 745, 9 L.Ed.2d 770 (1963) ? All these problems are common to state and federal prisoners, and the interest in finality operates equally in both situations. These problems raise, not the issue whether relitigation is necessary, but whether one adequate litigation has been afforded.
Source: Wikisource

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