Legal Prerequisites for Expert Witness Services ,Expert witnesses must have "knowledge, skill, experience, training, or education" that will "assist the trier of fact in understanding the evidence or determining a fact in dispute," according to Federal Rule of Evidence 702. This is an extremely broad standard.
An expert can be regarded to have particular knowledge of a subject beyond that of the typical person due to qualifications, training, education, occupation, publication, or experience, such that others may officially (and legally) depend on the individual's opinion on that topic.
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