Under the Fourth Amendment to the US Constitution, the police are prohibited from conducting a search and seizure without "probable cause." The Fourth Amendment protects us from unreasonable search and seizures of our person, our house, our papers, and our effects.The Fourth Amendment to the United States Constitution prohibits the federal government from conducting "unreasonable searches and seizures. Equality of rights under the law shall not be denied or abridged in the Commonwealth of Pennsylvania because of the race or ethnicity of the individual. 00c129v. But cracks in the Fourth Amendment have weakened our personal security. The Pennsylvania Supreme Court then reversed course. Amendment Four to the Constitution was ratified on December 15, 1791. It protects the American people from unreasonable searches and seizures. Amendment Four to the Constitution was ratified on December 15, 1791. It protects the American people from unreasonable searches and seizures.