She based her argument on First Amendment grounds, arguing she had a right to possess the explicit material. When the case reached the Supreme Court, they did not address her First Amendment claim but nullified her conviction for another reason. The court said that the evidence used against Mapp should never have been admitted in trial because it was seized without a legitimate warrant which violated her Fourth amendment rights. The Court addressed concerns of Mapp’s 4th Amendment protection against “unreasonable searches and seizures” and the incorporation of the Bill of Rights to state law. It addressed whether the search of Mapp's home was legal and if the evidence seized through that search was admissible in court. As Weeks v. United States, 1914, established the exclusionary rule barring the admission of illegally obtained evidence in federal