Summary

Portrait of Hugo Black Hugo Black Chapman v. California — Opinion of the Court

Under these circumstances, it is completely impossible for us to say that the State has demonstrated, beyond a reasonable doubt, that the prosecutor's comments and the trial judge's instruction did not contribute to petitioners' convictions. Such a machine-gun repetition of a denial of constitutional rights, designed and calculated to make petitioners' version of the evidence worthless, can no more be considered harmless than the introduction against a defendant of a coerced confession.
Source: Wikisource

Portrait of Hugo Black Hugo Black Chapman v. California — Opinion of the Court

We conclude that there may be some constitutional errors which in the setting of a particular case are so unimportant and insignificant that they may, consistent with the Federal Constitution, be deemed harmless, not requiring the automatic reversal of the conviction.
In fashioning a harmless-constitutional-error rule, we must recognize that harmless-error rules can work very unfair and mischievous results when, for example, highly important and persuasive evidence, or argument, though legally forbidden, finds its way into a trial in which the question of guilt or innocence is a close one.
Source: Wikisource

Portrait of Hugo Black Hugo Black Chapman v. California — Opinion of the Court

Whether a conviction for crime should stand when a State has failed to accord federal constitutionally guaranteed rights is every bit as much of a federal question as what particular federal constitutional provisions themselves mean, what they guarantee, and whether they have been denied. With faithfulness to the constitutional union of the States, we cannot leave to the States the formulation of the authoritative laws, rules, and remedies designed to protect people from infractions by the States of federally guaranteed rights.
Source: Wikisource

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