In contrast to a fact or lay witness, an expert witness is one who, by virtue of education, profession, publication, or experience, is believed to have special knowledge of his or her subject beyond that of the average person, sufficient that others may officially and legally rely upon the opinion.

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An expert witness is believed to have special knowledge beyond that of the average person and their opinion is legally relied upon by others. This is in contrast to a fact or lay witness who may only testify to what they personally observed or experienced.

In Contrast to a Fact or Lay Witness, an Expert