The doctrine of judicial review refers to the ability of a court to examine statutes, treaties and regulations that contradict provisions of existing law. This means that the courts are authorized to review decisions made by the executive and legislative branches.
This is an important faculty of the Supreme Court, even though it is not mentioned in the Constitution. Instead, this authority derives from the structure and history of the Constitution. This ability of the Court ensures that no law goes against the spirit of the Constitution. It also limits the freedom of the other branches when it comes to legislation.