The Fourth Amendment, however, is not a guarantee against all searches and seizures, but only those that are deemed unreasonable under the law. Security from searches and seizures.Fourth Amendment Explained. The Fourth Amendment to the U.S. Constitution gives citizens the right to be free from unreasonable searches and seizures. Pennsylvania residents are also protected under Article I §8 of the Pennsylvania Constitution. It also prevents unlawfully seized items from being used as evidence against them in criminal cases. A motion to suppress likely will be rooted in the Fourth Amendment which prevents police from engaging in a "fishing expedition. And the necessity of warrants for searches and seizures. —In the early days of the automobile, the Court created an exception for searches of vehicles, holding in Carroll v.