The Fourth Amendment prohibits only "unreasonable searches and seizures. " The key word is "unreasonable.The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated. The Fourth Amendment generally requires police to obtain a warrant before conducting a search. 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 Court finds that the Government's request runs afoul of the Fourth and Fifth Amendments, and the search warrant application must be DENIED. The Fourth Amendment prohibits the United States government from conducting "unreasonable searches and seizures. The Fourth Amendment is among the first ten amendments that make up "The Bill of Rights". Its meaning is to protect against arbitrary arrests. The 4 th Amendment to the US Constitution guarantees freedom from unreasonable search and seizure.