What Does the Fourth Amendment Mean? The Fourth Amendment generally requires government officials to obtain an arrest warrant or search warrant to execute a valid search and seizure.Probable cause along with exigent circumstances may justify a search or entry without a warrant. 2 This is also known as the "emergency doctrine. The Fourth Amendment protects citizens from unreasonable searches of their property and persons. This blog briefly outlines when police can reasonably search you and your house and how to challenge a possible unreasonable search in court. The Constitution and 4th Amendment protects many types of unreasonable searches and seizures, however, it does not protect against things left out on the open. Yet that's what the police did to Travis Tuggle without a warrant. His attorneys are seeking U.S. Supreme Court review. There is no general exception to the Fourth Amendment warrant requirement in national security cases.