United States v. Adams was a United States Supreme Court case that dealt with the issue of whether a person could be convicted of a crime if the evidence used to convict them was obtained through an illegal search and seizure. The case involved a man named Adams who was arrested for the possession of counterfeit money. The arresting officers had searched Adams' home without a warrant, and the evidence they found was used to convict him. The Supreme Court ruled that the evidence obtained through the illegal search and seizure was inadmissible in court, and that Adams could not be convicted on the basis of it. The Court held that the Fourth Amendment of the United States Constitution protects citizens from unreasonable searches and seizures, and that any evidence obtained through such searches and seizures is inadmissible in court. This ruling established the precedent that evidence obtained through illegal searches and seizures is inadmissible in court, and that citizens are protected from unreasonable searches and seizures by the Fourth Amendment.

In United States v. Adams, the Supreme Court was tasked with deciding whether a federal statute that allowed for the forfeiture of property used to facilitate an illegal act applied to vessels owned by citizens of one state and used in another state’s waters. The majority opinion held that it did apply, but Justice Field dissented from this ruling. He argued that Congress had no authority under the Constitution to pass such a law because it would interfere with states' rights over their own waterways and violate due process protections guaranteed by the Fifth Amendment. Furthermore, he noted that if Congress could enact laws like this one then they could also impose taxes on interstate commerce without any constitutional basis or limits on their power which would be unconstitutional as well. In conclusion, Justice Field believed that allowing for such forfeitures violated both states' rights and individual liberties protected by the Constitution and should not be upheld in court