In contrast, expert testimony is admissible only if the witness "qualifies as an expert by virtue of knowledge, skill, experience, education or training" and the testimony provided meets four requirements: increase. Knowledge helps those who know the facts to understand them.
The subject matter of the testimony must be related to the issue at issue. - The usefulness of the testimony outweighs the ill effects it can have.
In the common law system, an expert opinion is usually provided by one of the parties. Evidence must be credible, relevant to the case, conclusive rather than conclusive, and permissible for fact-checking. A fact-finder determines how much weight is given to testimony.
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