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.
State court (United States)
Generally, state courts are common law courts, and apply their respective state laws and procedures to decide cases. They are organized pursuant to and apply the law in accordance with their state's constitution, state statutes, and binding decisions of courts in their state court hierarchy. Where applicable, they also apply federal law. Generally, a single judicial officer, usually called a judge, exercises original jurisdiction by presiding over contested criminal or civil actions which culminate in trials, although most matters stop short of reaching trial. The decisions of lower courts may be reviewed by a panel of a state court of appeals. Generally, there is also a highest court for appeals, a state supreme court, that oversees the court system. In matters that involve issues of federal law, the final decision of the state's highest court (including refusals to hear final appeals) may be appealed to the United States Supreme Court (which also has the discretion to refuse to hear them).