Expert Witnesses In Court

Rule 702 of the Federal Rules of Evidence provides the parameters for which an expert may testify. “A witness who is qualified as an expert by knowledge, skill, experience, training or education may testify in the form of an opinion or otherwise if:

  1. the expert’s scientific, technical or other specialized knowledge will help the trier of fact to understand the evidence or determine a fact in issue;
  2. the testimony is based on sufficient facts or data;
  3. the testimony is the product of reliable principles or methods; and
  4. the expert has reliably applied the principles and methods to the facts of the case.
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