On May 23, 1957, police officers in a Cleveland, Ohio suburb received information that a suspect in a bombing case, as well as some illegal betting equipment, might be found in the home of Dollree Mapp. Three officers went to the home and asked for permission to enter, but Mapp refused to admit them without a search warrant. Two officers left, and one remained. Three hours later, the two returned with several other officers. Brandishing a piece of paper, they broke in the door. Mapp asked to see the “warrant” and took it from an officer, putting it in her dress. The officers struggled with Mapp and took the piece of paper away from her. They handcuffed her for being “belligerent.”
Police found neither the bombing suspect nor the betting equipment during their search, but they did discover some pornographic material in a suitcase by Mapp's bed. Mapp said that she had loaned the suitcase to a boarder at one time and that the contents were not her property. She was arrested, prosecuted, found guilty, and sentenced for possession of pornographic material. No search warrant was introduced as evidence at her trial.
At the trial the police officers did not show Mapp and her attorney the alleged search warrant or explain why they refused to do so. Nevertheless, the court found Mapp guilty and sentenced her to jail. After losing an appeal to the Ohio Supreme Court, Mapp took her case to the U.S. Supreme Court. The Court determined that evidence obtained through a search that violates the Fourth Amendment is inadmissible in state courts.