Wisconsin circuit courts
In addition, the courts are constrained from taking action that will encroach on the powers of the legislative or executive branches. Under the separation of powers doctrine, no branch of government may exercise a power of government assigned exclusively to another branch. The purpose of separating powers among the branches of government is to avoid concentration of governmental power in the hands of a new and to give the various branches the ability to check actions by the other branches.
Separation of powers under the United States Constitution
The judicial branch of government holds powers as well. They have the ability to use express and concurrent powers to make laws and establish regulations. They use express powers to interpret laws and perform judicial review. Implied powers are used by this branch to declare laws that were previously passed by a lower court unconstitutional. They can also use express powers to declare laws that are in the process of being passed unconstitutional. Concurrent powers are used to make it so that state courts can conduct trials and interpret laws without the approval of federal courts and federal courts can hear appeals form lower state courts.