CA Civ Proc Code Section 708.130

(a)

Witnesses may be required to appear and testify before the court or referee in an examination proceeding under this article in the same manner as upon the trial of an issue.

(b)

The privilege prescribed by Article 4 (commencing with Section 970) of Chapter 4 of Division 8 of the Evidence Code does not apply in an examination proceeding under this article.