Whether Teague v. Lane's limits on announcing new constitutional rules on collateral review apply to capital-sentencing habeas cases.
Holding
Yes. Teague generally applies to collateral challenges to capital sentences, subject to its established exceptions.
Reasoning
The Court held that the finality and comity concerns underlying Teague apply to a capital sentence as well as to a conviction. A criminal judgment includes its sentence, and collateral attacks on a death sentence, like attacks on a conviction, can delay the final resolution of the case.
Teague therefore generally bars a federal habeas court from announcing or applying a new rule—one not dictated by precedent when the defendant's conviction became final—unless the rule fits an exception. The Court applied that framework before reaching Penry's constitutional claims.