This Fourth Amendment activity is based on the landmark Supreme Court case Brendlin v. California, dealing with search and seizure during a traffic stop.The Fourth Amendment, however, is not a guarantee against all searches and seizures, but only those that are deemed unreasonable under the law. The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated. If courts find a search or seizure is not reasonable and a person's 4th. The Fourth Amendment prohibits the United States government from conducting "unreasonable searches and seizures. The Fourth Amendment's rule against unreasonable search and seizures means that police may not search you or your property unless one of the following is true:. The Fourth Amendment does not give individuals an absolute right to privacy; neither does it prohibit all searches. Probable cause is present when the police officer has a reasonable belief in the guilt of the suspect based on the facts and information prior to the arrest. A police officer must fill out an affidavit and present it to a neutral judge or magistrate to obtain a warrant.