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The role of expert witnesses in English law is to give explanations of difficult or technical topics in civil and criminal trials, to assist the fact finding process. The extent to which authorities have been allowed to testify, and on what topics, has been debated, and to this end a variety of criteria have evolved throughout English case law.
In United States law, the Frye standard, Frye test, or general acceptance test is a judicial test used in some U.S. state courts to determine the admissibility of scientific evidence. It provides that expert opinion based on a scientific technique is admissible only when the technique is generally accepted as reliable in the relevant scientific ...
Although the Daubert standard is now the law in federal court and over half of the states, the Frye standard remains the law in some jurisdictions including California, Illinois, Pennsylvania, and Washington. [9] Florida passed a bill to adopt the Daubert standard as the law governing expert witness testimony, which took effect on July 1, 2013 ...
An expert witness, particularly in common law countries such as the United Kingdom, Australia, and the United States, is a person whose opinion by virtue of education, training, certification, skills or experience, is accepted by the judge as an expert.
Under Daubert, certain factors contribute to the reliability, and hence the admissibility, of expert testimony, one of which is the general validity of the expert's methods. The district court found the tire expert's methods not to be scientifically valid, and hence excluded his testimony. This resulted in a conclusion that Kumho Tire would ...
The literature relating to questioned document examination is very extensive. Publications in English, French, German, and other languages are readily available. The following is a very brief list of English-language textbooks: Osborn, A.S. (1929). Questioned Documents, 2nd ed. Albany, New York: Boyd Printing Company. Reprinted, Chicago: Nelson ...
Note that under California Evidence Code ("CEC") §§769, 770, and 1235, prior inconsistent statements may be used for both impeachment and as substantive evidence, even if they were not originally made under oath at a formal proceeding, as long as "the witness was so examined while testifying as to give him an opportunity to explain or to deny ...
Rule 612. Writing Used to Refresh a Witness's Memory; Rule 613. Witness's Prior Statement; Rule 614. Court's Calling or Examining a Witness; Rule 615. Excluding Witnesses; Opinions and Expert Testimony. Rule 701. Opinion Testimony by Lay Witnesses; Rule 702. Testimony by Expert Witnesses; Rule 703. Bases of an Expert's Opinion Testimony; Rule 704.