The Mapp v. Ohio Supreme Court case involved Dollree Mapp, whose home was searched without a warrant by police in Cleveland, Ohio. The police found obscene photos during the search and arrested Mapp. While Mapp was found guilty, she appealed the case to the Supreme Court. The Supreme Court ruled the search was likely illegal and established that the 4th Amendment determines the legality of searches, setting the precedent that all evidence obtained without a proper warrant is inadmissible in court.