The Fourth Amendment was the founding generation's response to the reviled 'general warrants' and 'writs of assistance' of the colonial era. What Does the Fourth Amendment Mean?The Fourth Amendment (Amendment IV) to the United States Constitution is part of the Bill of Rights. It prohibits unreasonable searches and seizures. It will eliminate loopholes that let the government investigate us and our property without having to get a warrant. The police did not have evidence that contraband was in the room and the officers could have "covered" the entrance until a search warrant could be obtained. The Fourth Amendment protects against unreasonable searches and seizures. It requires a warrant, based on probable cause, for searches. Did the use of a pen register without a warrant violate the Fourth Amendment protection against unreasonable searches and seizures? American Revolution, the Fourth Amendment of the Bill of Rights guaranteed.