In the Gaines v. Washington case of 1927, the U.S. Supreme Court ruled on a dispute involving an African American man named Leonard Gaines who was convicted for murder in Washington state and sentenced to death. The defense argued that his constitutional rights were violated because he was not allowed to testify at his own trial due to a state law prohibiting defendants from testifying in their cases. However, the Supreme Court upheld Gaines' conviction by a vote of 6-2, stating that this prohibition did not violate the Fourteenth Amendment's guarantee of equal protection under law or Fifth Amendment's right against self-incrimination since it applied equally to all defendants regardless of race or color. This decision underscored states' power over criminal procedure within their jurisdictions during this period.

In the dissenting opinion for Gaines v. Washington, Justice Oliver Wendell Holmes Jr., joined by Justice Louis Brandeis, argued that the state of Washington had not violated Gaines' constitutional rights. They contended that while it was true that a confession obtained through physical violence would be inadmissible as evidence, there was no clear proof to suggest such coercion took place in this case. The majority's decision to overturn the conviction based on mere suspicion or possibility of forceful extraction of confession seemed unwarranted and speculative to them. Furthermore, they believed it wasn't within their jurisdiction to question the credibility and reliability of witnesses who testified under oath during trial proceedings at lower courts unless there were glaring inconsistencies or contradictions in their testimonies which could potentially lead to miscarriage of justice - something they didn't find applicable here.