Petitioners in federal habeas proceedings that have already been decided in a previous habeas petition would find the claims barred. Additionally, petitioners who had already filed a federal habeas petition were required to first secure authorization from the appropriate federal court of appeals. Furthermore, AEDPA took away from the Supreme Court the power to review a court of appeals's denial of that permission, thus placing final authority for the filing of second petitions in the hands of the federal courts of appeals.