In the case of Townsend v. Sain, Sheriff, et al., 1962, the U.S Supreme Court ruled in favor of defendant George Townsend who had been convicted for murder and sentenced to life imprisonment by an Illinois court. The issue at hand was whether a confession obtained from Townsend while he was under the influence of a "truth serum" (a drug that supposedly makes one unable to lie) could be used as evidence against him. The Supreme Court held that this violated his Fifth Amendment rights against self-incrimination because he did not voluntarily give his confession; it was induced by drugs administered by police officers without his consent or knowledge about their effects. Furthermore, they found that lower courts failed to provide a full and fair hearing on this matter which also violated his Fourteenth Amendment right to due process. Therefore, they remanded the case back for further proceedings consistent with these constitutional standards.

In the dissenting opinion for Townsend v. Sain, Justice Harlan argued that federal courts should not have such broad authority to hold evidentiary hearings in habeas corpus cases involving state prisoners. He believed this would undermine the finality of state court judgments and disrupt the balance between federal and state judicial responsibilities. Instead, he suggested a more limited standard where federal courts could only conduct an evidential hearing if there was reason to believe that crucial facts were overlooked or misunderstood by the state court due to constitutional error or other exceptional circumstances. This approach would respect both states' rights and individual liberties while ensuring fair treatment for all parties involved.