The Fourth Amendment to the U.S. Constitution gives citizens the right to be free from unreasonable searches and seizures. The Supreme Court usually considers Fourth Amendment cases starting with a basic question, "Was there a search or a seizure?AMENDMENT 4—SEARCHES AND SEIZURES have been reaffirmed directly in a Fourth Amendment case. The Fourth Amendment prohibits the United States government from conducting "unreasonable searches and seizures. Under the Fourth Amendment to the US Constitution, the police are prohibited from conducting a search and seizure without "probable cause." Amendment Four to the Constitution was ratified on December 15, 1791. It protects the American people from unreasonable searches and seizures. Constitution of the Commonwealth of Pennsylvania. Article I. Declaration of Rights. The Fourth Amendment to the United States Constitution protects citizens' privacy.