Chad's legal system is based on French civil law and Chadian customary law where the latter does not interfere with public order or constitutional guarantees of equality. Despite the constitution's guarantee of judicial independence, the president names most key judicial officials. The legal system's highest jurisdictions, the Supreme Court and the Constitutional Council, have become fully operational since 2000. The Supreme Court is made up of a chief justice, named by the president, and 15 councillors, appointed for life by the president and the National Assembly. The Constitutional Court is headed by nine judges elected to nine-year terms. It has the power to review legislation, treaties and international agreements prior to their adoption.