Section 804 Of Article 1. Expert And Other Opinion Testimony Generally From California Evidence Code >> Division 7. >> Chapter 1. >> Article 1.
804
. (a) If a witness testifying as an expert testifies that his
opinion is based in whole or in part upon the opinion or statement of
another person, such other person may be called and examined by any
adverse party as if under cross-examination concerning the opinion or
statement.
(b) This section is not applicable if the person upon whose
opinion or statement the expert witness has relied is (1) a party,
(2) a person identified with a party within the meaning of
subdivision (d) of Section 776, or (3) a witness who has testified in
the action concerning the subject matter of the opinion or statement
upon which the expert witness has relied.
(c) Nothing in this section makes admissible an expert opinion
that is inadmissible because it is based in whole or in part on the
opinion or statement of another person.
(d) An expert opinion otherwise admissible is not made
inadmissible by this section because it is based on the opinion or
statement of a person who is unavailable for examination pursuant to
this section.