Section 773 Of Article 2. Examination Of Witnesses From California Evidence Code >> Division 6. >> Chapter 5. >> Article 2.

. (a) A witness examined by one party may be cross-examined upon any matter within the scope of the direct examination by each other party to the action in such order as the court directs.
  (b) The cross-examination of a witness by any party whose interest is not adverse to the party calling him is subject to the same rules that are applicable to the direct examination.