In the United States v. Lynch case of 1890, the Supreme Court ruled on a dispute involving maritime law and salvage rights. The defendant, Lynch, had salvaged cargo from a shipwrecked vessel off the coast of Florida without reporting it to customs officials as required by federal law. Upon discovery, U.S authorities seized his property and initiated legal proceedings against him for violating custom laws. However, Lynch argued that he was not bound by these laws because they were in conflict with international maritime law which allows free access to wrecked goods at sea without any obligation to report them to local authorities. The Supreme Court disagreed with this argument stating that while international maritime law does permit free access to wrecked goods at sea; once those goods are brought within U.S territory they become subject to domestic laws including customs regulations requiring their declaration upon entry into port. Therefore, even though Lynch's initial act of salvaging was lawful under international standards; his failure afterwards to comply with national legislation rendered his actions illegal leading ultimately towards forfeiture of all recovered items back into government possession.

In the dissenting opinion for United States v. Lynch, Justice Lamar argued that the majority's decision to uphold a conviction based on evidence obtained through an unlawful search and seizure was in violation of the Fourth Amendment rights of the defendant. He contended that allowing such evidence to be used would set a dangerous precedent, effectively sanctioning illegal actions by law enforcement officials and undermining citizens' constitutional protections against unreasonable searches and seizures. Furthermore, he expressed concern over potential abuses of power by authorities if they were permitted to violate individuals' privacy rights without consequence or oversight. In his view, this ruling threatened not only individual liberties but also public trust in law enforcement agencies and judicial processes.