The judicial branch is established in Article III of the Constitution and is meant to hear civil and criminal cases. There is a hierarchy of federal courts with 94 district courts, courts of appeal, and the Supreme Court. Cases flow from lower to higher courts, and the Supreme Court has the final say on whether laws are constitutional. The Supreme Court is located in Washington D.C. and has 9 justices appointed by the president and approved by the Senate. It establishes precedents through majority and dissenting opinions.