What Does the Fourth Amendment Mean? Evidence obtained without a valid warrant is excluded at trial unless there was a warrant exception.Persons not named in or referred to in the search warrant may not be searched unless either: i. Probable cause exists in regard to the. Free Consultation - Call 617.936. We are an independent branch of government constitutionally entrusted with the fair and just resolution of disputes in order to preserve the rule of law. Warrantless searches are generally not permitted in exclusively domestic security cases. Amendment interests in the car. The Fourth Amendment protects all Americans from unreasonable searches and seizures. There is no general exception to the Fourth Amendment warrant requirement in national security cases.