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Typically, experts are relied on by both sides to a dispute for opinions on severity of injury, degree of insanity, cause of failure in a machine or other device, and the like.

The tribunal itself, or the judge, can in some systems call their own experts to technically evaluate a certain fact or action, in order to provide the court with a complete knowledge on the fact/action it is judging. The expertise has the legal value of an acquisition of data. The results of these experts are then compared to those by the experts of the parties.

The expert has heavy responsibility, especially in penal trials, and false witness by an expert is a severely punished crime in most countries. The use of expert witnesses is sometimes criticized in the United States because in civil trials, they are often used by both sides to advocate differing positions, and it is left up to a juryIn the law, a jury is a body of persons convened to render a verdict, or true answer or decision, on a question officially submitted to them, as on the question of a defendant's guilt in a jury trial in a court of law. The members of a jury are known as j of laymen to decide which expert witness to believe. Sometimes one side has utilized an expert witness to provide fraudFraud is the crime or offense of deliberately deceiving another in order to damage them usually, to obtain property or services from him unjustly. Fraud can be committed through many methods, including mail, wire, phone, and the Internet. Forms of criminaulant or junk scienceJunk science is a term used to derogate purportedly scientific data, research, analyses or claims which are driven by political, financial or other questionable motives. Compare to pseudoscience. Like many other ideological terms, there is often no politi testimonyIn law and in religion, testimony is a solemn attestation as to the truth of a matter. The act of providing testimony is to testify . In the law, testimony generally involves a statement of fact or opinion by a witness under oath or affirmation. In religi in order to convince a jury.

In most systems, the trialA trial is, in the most general sense, a test, usually a test to see whether something does or does not meet a given standard. In law a trial is the presentation of information in a formal setting, usually a court, with the object of determining whether o (or the procedure) can be suspended in order to allow the experts to study the case and produce their results.

The earliest known use of an expert witness in English law came in the 1782, when a court that was hearing litigation relating to the silting-up of Wells harbour in NorfolkFor alternative meanings see: Norfolk (disambiguation Norfolk (pronounced 'norfuck') is a low-lying county in East Anglia in the east of southern England. It has borders with Lincolnshire to the west, Cambridgeshire to the west and southwest and with Suff accepted evidence from a leading civil engineerThe term civil engineer refers to an individual who practices civil engineering. Originally the term "civil" engineer worked on public works projects and was contrasted with the military engineer, who worked on armaments and defenses. Over time, civil eng, John Smeaton. This decision by the court to accept Smeaton's evidence is widely cited as the root of modern rules on expert evidence.