Wong Sun v. United States is a landmark Supreme Court case from 1973 that addressed the issue of unlawful searches and the exclusionary rule, particularly concerning the protection against self-incrimination. This case established that evidence obtained through illegal means, such as without a proper warrant, cannot be used in court, thus reinforcing an individual's right to be free from unreasonable searches and seizures. The ruling emphasized the necessity of upholding constitutional rights even when law enforcement actions may have led to confessions or other incriminating evidence.