CALIFORNIA EVIDENCE: CIVIL AND CRIMINAL
...Opinion & Scientific Evidence
......Expert Testimony: Qualifications
.........Qualifications of Expert
............Qualifications: Education
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Witness is qualified as expert if s/he has special knowledge, skill, experience, training or education to be considered an expert on the subject of the testimony.

Witness may qualify as expert based upon study of a subject and contact with other professionals in field; standards for medical experts apply to lawyers.