is defined by the Constitution and the laws of Puerto Rico. In general, the jurisdictional structure parallels that of the state Supreme Courts in the continental United States. The Supreme Court of Puerto Rico has concurrent jurisdiction with federal courts to interpret federal laws, unless the Supremacy Clause requires otherwise. Judgments that stand on federal law grounds may be reviewed by the United States Supreme Court, unless an adequate and independent ground for the decision based in Puerto Rico commonwealth law is also present. The Court has the power of judicial review and its decision are considered binding precedent within the jurisdiction of Puerto Rico. The Supreme Court of Puerto Rico also regulates the practice of law in Puerto Rico. The term of the Puerto Rico Supreme Court begins on the first Monday of October and ends in the last week of June of the following year. However, during the recess months of July through September, an alternating panel of three justices are allowed to hear cases and their decisions are considered binding precedent. However, in order for any law passed by the Legislative Assembly to be declared unconstitutional, it requires the votes of a majority of the total membership of the Court, therefore, a three-justice panel may not hear constitutional challenges to laws passed by the Legislature. The justices decide whether or not to hear oral arguments for the case. If the case is controversial or carries high public interest, an oral argument may be scheduled, although oral arguments were rare under Chief Justice Hernández Denton. When oral argument occurs, each side has twenty-five minutes to state its respective claims and five minutes for rebuttal. After the sides have ended their argument, each justice has ten minutes (in order of seniority) to ask questions to each side. Justices may decide to yield the balance of their time to one of their colleagues. Because several Federal judges have voluntarily withdrawn from the Puerto Rico Bar Association and was converted by statute into a voluntary membership organization, the Supreme Court of Puerto Rico maintains the official bar records of Puerto Rico licensed attorneys. Chief Justices The Chief Justice is the presiding officer of the Supreme Court, and amongst its functions it directs the administration of the different courts, chairs the Constitutional Redistricting Board which revises Puerto Rico's senatorial and representative districts after every decennial census, and presides at the impeachment trial