Judge

A judge, or arbiter of justice, is an official who presides over a court of law, which is operated by the local, state, and/or federal government(s). The powers, functions, method of appointment, discipline, and training of judges vary widely across different jurisdictions. The judge is like an umpire in a game and conducts the trial impartially and in an open court. The judge hears all the witnesses and any other evidence presented by the prosecution and the defence. If the accused is convicted, then the judge pronounces the sentence.

In common law countries, such as the United States, and those with roots in the Commonwealth of Nations, judges have a number of powers which are not known to exist, or are not acknowledged to exist, in civil law legal systems, which collectively make the judiciary a more powerful political force than in civil law countries.

One of these powers is the "contempt of court" power. In a common law system, a judge typically has the power to summarily punish with a fine or imprisonment any misconduct which takes place in the courtroom, and to similarly punish violations of the court's orders, after a hearing, when they take place outside the courtroom. This power, in turn, may be used by common law judges to enforce orders for injunctive relief, which is a court order to take or refrain from taking some particular act, directed at the individual who must do so. This power is a vestige of authority that members of the nobility had when they personally presided over disputes between their subjects. It has the effect of giving common law country judges great power to fashion remedies, such as school desegregation orders and restraining orders directed at individuals. Civil law judges, in contrast, outside of specialized courts with narrowly delineated powers, generally lack contempt power or the power to impose injunctive relief.

Another power of every judge in the United States, generally right down to the level of the magistrate, is the power to declare a law unconstitutional and invalid, at least as applied in a particular case. In contrast, most civil law countries limit this power to a special constitutional court, and all other judges are required to follow the enacted laws, even if the judge personally believes those laws to be unconstitutional, in the absence of an order from the constitutional court. However, if a person believes that a law applied against them in court is unconstitutional, they can apply for consideration in the constitutional court and, if the law is indeed declared unconstitutional, file an appeal against the ruling based on the now-invalidated law.

Similarly, in the common law system, cases in which the government administration is at issue, known as public law cases, for example, suits claiming violations of civil rights by government officials, are often heard by the same judges who handle criminal cases and disputes between private individuals. In contrast, in civil law countries, only designated judges or quasi-judges (such as the Conseil d'État in France) can hear public law cases, and ordinary judges can hear only criminal cases and cases involving private parties.

Judges in a common law system are also empowered, and for the most part required, to make law guided by past precedent, or to choose to ignore past precedent as no longer applicable, based on a concept known as "stare decisis" ("to stand by what has been decided"), in cases where no statute or prior case clearly mandates a particular result, and in cases where past precedents, for some reason, no longer appear to provide firm guidance as to the current state of the law. For example, in a case of "first impression" which has never arisen in a publicly reported case in a state, a judge must choose which rule will apply, usually informed by decisions which have been made in similar cases in other jurisdictions and based on the public policies involved. Judges in civil law systems, in contrast, are strictly forbidden from "making law" and, as a general rule, are not bound by or even encouraged to refer to precedents established in prior similar cases.

Civil law judges, likewise, have some powers not usually held by common law judges. Most importantly, a common law judge is usually required to base a decision almost exclusively on the evidence provided by the parties to a case during the course of a trial, or a hearing, or in documents filed with the court. In contrast, a civil law judge frequently has the authority to investigate the facts of a case independently of evidence provided by the parties to that case, in what is known as an "inquisitorial" role.

All judges must sign a judicial oath which is a fiduciary undertaking or a promise of duty of care. Yet the moment it is signed, the judge is protected with judicial immunity which prevents anyone from testing the obligation the judge undertook in the oath. Arguments against the judicial immunity say this law is allowing judges a special method of escape for claims for breach of fiduciary duty which is something no other fiduciary apart from politicians can obtain.