The U.S. Supreme Court case Ashcraft et al. v. Tennessee (1945) revolved around the issue of coerced confessions and their admissibility in court trials. The petitioner, Ashcraft, was convicted for murder based on a confession obtained after 36 hours of continuous questioning by police officers without sleep or rest breaks - an interrogation method deemed as inherently coercive by the defense team. The state courts upheld his conviction arguing that there was no physical brutality involved during the interrogation process to render it unconstitutional under due process clause of Fourteenth Amendment. However, upon review, the Supreme Court reversed this decision with a 5-4 majority ruling stating that psychological coercion can be just as damaging and unlawful as physical torture or violence when obtaining confessions from suspects; hence such methods violate constitutional rights against self-incrimination and fair trial guarantees under Fifth and Sixth Amendments respectively. In essence, this landmark judgment underscored that any form of undue pressure exerted on defendants to extract admissions is unacceptable in American jurisprudence system irrespective of whether they are physically abusive or psychologically manipulative.

In the dissenting opinion for Ashcraft et al. v. Tennessee, Justice Frank Murphy argued that the 36-hour interrogation of Ashcraft was a form of psychological coercion and thus violated his constitutional rights under the Fifth Amendment's protection against self-incrimination. He contended that such an intense and prolonged questioning could easily lead to false confessions, undermining the integrity of criminal proceedings. Furthermore, he emphasized that it is not only physical brutality but also mental torture which can be classified as unconstitutional methods in obtaining evidence or confession from a suspect. Therefore, he disagreed with majority’s decision upholding Ashcraft’s conviction based on his confession during this extended interrogation period without sleep or rest.