This Fourth Amendment activity is based on the landmark Supreme Court case Brendlin v. California, dealing with search and seizure during a traffic stop.This amendment forms the basis for the laws surrounding search and seizure rights. Amendment Four to the Constitution was ratified on December 15, 1791. It protects the American people from unreasonable searches and seizures. The Fourth Amendment to the U.S. Constitution protects you from unreasonable searches and seizures. The Fourth Amendment to the United States Constitution prohibits the federal government from conducting "unreasonable searches and seizures. Luckily, the Supreme Court recently decided these questions in the case of Carpenter v. The United States, 138 S. Ct. 2206 (2018) and Riley v. Investigations into neglect constitute the vast majority of child welfare investigations in the United States.