Adversarial system

A judge is a person who presides over court proceedings, either alone or as a part of a judicial panel. In an adversarial system, the judge hears all the witnesses and any other evidence presented by the barristers or solicitors of the case, assesses the credibility and arguments of the parties, and then issues a ruling in the case based on their interpretation of the law and their own personal judgment. A judge is expected to conduct the trial impartially and, typically, in an open court.

The powers, functions, method of appointment, discipline, and training of judges vary widely across different jurisdictions. In some jurisdictions, the judge's powers may be shared with a jury. In inquisitorial systems of criminal investigation, a judge might also be an examining magistrate. The presiding judge ensures that all court proceedings are lawful and orderly.

An inquisitorial system is a legal system in which the court, or a part of the court, is actively involved in investigating the facts of the case. This is distinct from an adversarial system, in which the role of the court is primarily that of an impartial referee between the plaintiff or prosecution and the defense.

Inquisitorial systems are used primarily in countries with civil legal systems, such as France and Italy, or legal systems based on Islamic law like Saudi Arabia, rather than in common law systems. It is the prevalent legal system in Continental Europe, Latin America, African countries not formerly under British rule, East Asia (except Hong Kong), Indochina, Thailand, and Indonesia. Most countries with an inquisitorial system also have some form of civil code as their main source of law. Countries using common law, including the United States, may use an inquisitorial system for summary hearings in the case of misdemeanors or infractions, such as minor traffic violations.

A prosecutor is a legal representative of the prosecution in states with either the adversarial system, which is adopted in common law, or inquisitorial system, which is adopted in civil law. The prosecution is the legal party responsible for presenting the case in a criminal trial against the defendant, an individual accused of breaking the law. Typically, the prosecutor represents the state or the government in the case brought against the accused person.

Traditional Chinese law refers to the legal system including laws, regulations, and rules used in Sinosphere. It has undergone continuous development since at least the 11th century BCE. This legal tradition is distinct from the common law and civil law traditions of the West – as well as Islamic law and classical Hindu law – and to a great extent, is contrary to the concepts of contemporary Chinese law. It incorporates elements of both Legalist and Confucian traditions of social order and governance.

One feature of the traditional Chinese criminal procedure is that it was an inquisitorial system where the judge, usually the district magistrate, conducts the public investigation of a crime. This is comparable to the system used in civil law jurisdictions, but contrary to common law which uses an adversarial system where the judge decides between attorneys representing the prosecution and defense. "The Chinese traditionally despised the role of advocate and saw such people as parasites who attempted to profit from the difficulties of others. The magistrate saw himself as someone seeking the truth, not a partisan for either side."

Beyond (a) reasonable doubt is a legal standard of proof required to validate a criminal conviction in most adversarial legal systems. It is a higher standard of proof than the standard of balance of probabilities (US English: preponderance of the evidence) commonly used in civil cases, reflecting the principle that in criminal cases the stakes are significantly higher: a person found guilty can be deprived of liberty or, in extreme cases, life itself, in addition to the collateral consequences and social stigma attached to conviction. The prosecution bears the burden of presenting compelling evidence that establishes guilt beyond a reasonable doubt; if the trier of fact is not convinced to that standard, the accused is entitled to an acquittal. Originating in part from the principle sometimes called Blackstone's ratio—"It is better that ten guilty persons escape than that one innocent suffer"—the standard is now widely accepted in criminal justice systems throughout common law jurisdictions.

A brief (Old French from Latin brevis, "short") is a written legal document used in various legal adversarial systems that is presented to a court arguing why one party to a particular case should prevail.

In England and Wales (and other Commonwealth countries, e.g., Australia) the phrase refers to the papers given to a barrister when they are instructed.