German Law on the Federal Constitutional Court (PDF)

The Federal Constitutional Court (German: Bundesverfassungsgericht, or BVerfG) is a supreme constitutional court established by the constitution or Basic Law ("Grundgesetz") of Germany. Since its inception with the beginning of the Federal Republic of Germany, the court has been located in the city of Karlsruhe—intentionally distanced from the other federal institutions in Berlin (earlier in Bonn) and other cities.

The main task of the court is judicial review, and it may declare legislation unconstitutional, thus rendering them ineffective. In this respect, it is similar to other supreme courts with judicial review powers, yet the court possesses a number of additional powers, and is regarded as among the most interventionist and powerful national courts in the world. 

German Law onthe Federal Constitutional Court (PDF)

Website of  the Federal Constitutional Court of German:

 http://www.bundesverfassungsgericht.de/EN/Homepage/home_node.html