The Fourth Amendment protects against unreasonable searches and seizures. It requires a warrant, based on probable cause, for 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. The Fourth Amendment provides that "no warrants shall issue, but upon probable cause. California, 551 U.S. __, 127 S. Ct. 2400 (2007). Prior to last Friday, it would be easy to say that the records could likely be used without implicating the Fourth Amendment. To satisfy the Fourth Amendment and the. The Fourth Amendment provides that "no warrants shall issue, but upon probable cause. A police officer must fill out an affidavit and present it to a neutral judge or magistrate to obtain a warrant. The Fourth Amendment to the United States Constitution guarantees the right to be free from unreasonable searches and seizures.