Summary

Portrait of Earl Warren Earl Warren Townsend v. Sain — Opinion of the Court

Where newly discovered evidence is alleged in a habeas application, evidence which could not reasonably have been presented to the state trier of facts, the federal court must grant an evidentiary hearing. Of course, such evidence must bear upon the constitutionality of the applicant's detention; the existence merely of newly discovered evidence relevant to the guilt of a state prisoner is not a ground for relief on federal habeas corpus. Also, the district judge is under no obligation to grant a hearing upon a frivolous or incredible allegation of newly discovered evidence.
Source: Wikisource

Portrait of Earl Warren Earl Warren Townsend v. Sain — Opinion of the Court

But the crucially informative characterization of the drug, the characterization which would have enabled the judge and jury, mere laymen, intelligently to grasp the nature of the substance under inquiry, was inexplicably omitted from the medical experts' testimony. Under the circumstances, disclosure of the identity of hyoscine as a 'truth serum' was indispensable to a fair, rounded, development of the material facts. And the medical experts' failure to testify fully cannot realistically be regarded as Townsend's inexcusable default.
Source: Wikisource

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