I need help with government!! please help?

Judicial review is the ability of the courts to establish how each law will be followed. They have the right to rule according to what they beleive the law is ment to protect. Basically it means they determine how the law will be inforced and in what situations. It was first used in the case of Marbury Vs. Madison. Judicial review is not a constitutional principle because it is not talked aobut in the constitution.