Section 13.3 Cross-Examination of Expert Witness

• Jurisdiction: Arizona

When an expert offers his opinion he exposes himself to a different type of inquiry on cross-examination than would be permitted of the ordinary factual witness. He invites investigation into the extent of his knowledge and the reasons for his opinion, including facts upon which it is based and which he considered. He may be subjected to the most rigid cross-examination concerning his qualifications and the sources of his opinion.

State ex rel. Herman v. Saldamando, 12 Ariz. App. 474, 472 P.2d 85 (1970)

It is appropriate cross-examination of an appraiser to inquire into earlier sales of nearby properties, even as much as 10 to 13 years before the date of valuation. The field of inquiry in a cross-examination is somewhat greater than that...