The Fourth Amendment, however, is not a guarantee against all searches and seizures, but only those that are deemed unreasonable under the law. Under the Fourth Amendment to the US Constitution, the police are prohibited from conducting a search and seizure without "probable cause."The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated. 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. The Fourth Amendment prohibits the United States government from conducting "unreasonable searches and seizures. It breaks with the broad purpose behind the Fourth Amendment, which is to make us secure in our property. Violation of the Pennsylvania Constitution, the Fourth Amendment, the. Pennsylvania Wiretap Act and the recent decision in Carpenter? This page contains significant and relevant cases that were incorporated into annual Legal Updates training.