In Eaton v. City of Tulsa (1973), the U.S Supreme Court addressed a case involving an individual, Eaton, who was convicted for refusing to answer questions during a grand jury investigation into alleged local police corruption in Tulsa. The Oklahoma courts held that his refusal violated state law and he was sentenced to jail time. However, Eaton argued that his Fifth Amendment rights were violated as he wasn't informed about his right against self-incrimination before being questioned by the grand jury. The Supreme Court ruled in favor of Eaton stating that although it is not necessary for every witness appearing before a grand jury to be warned about their constitutional rights under the Fifth Amendment, such warnings are required when there's reason to believe that circumstances clearly indicate a real danger of self-incrimination. In this case, since authorities had already indicated they believed him guilty of criminal conduct related to the matter under investigation by the grand jury and because he could have incriminated himself with his answers due to potential perjury charges from previous testimony or new evidence uncovered through further questioning - these constituted sufficient grounds necessitating warning him about his right against self-incrimination.

In the dissenting opinion for Eaton v. City of Tulsa, Justice Douglas argued that the majority's decision to uphold a city ordinance requiring police officers to retire at age 62 was inconsistent with previous rulings on mandatory retirement ages. He believed that such an arbitrary cutoff point violated equal protection rights under the Fourteenth Amendment, as it did not take into account individual differences in physical and mental capabilities among older workers. Furthermore, he pointed out that there were other less discriminatory ways for ensuring fitness for duty among police officers, such as regular physical examinations or performance evaluations. Therefore, he concluded that this type of blanket age-based discrimination should be subjected to strict scrutiny by courts and generally found unconstitutional unless proven necessary by compelling state interests.