They are administered independently by their own governments, legislatures and judiciaries, but are not sovereign. All state judiciaries are bound to enforce treaties, state laws notwithstanding. The ordinary courts are divided between federal and state judiciaries. It endeavours to build the capacity of African judiciaries to investigate and prosecute crimes. Then, criminal justice systems began incorporating science into the procedures of police and judiciaries. Nevin has helped newly formed countries set out their own rules for their judiciaries. This is where majority of the judiciaries cases are heard. Therefore, most of Singapore's judiciaries come from the school. McMahon served as a law clerk for state and federal judiciaries for many years.