Section 770 Of Article 2. Examination Of Witnesses From California Evidence Code >> Division 6. >> Chapter 5. >> Article 2.

. Unless the interests of justice otherwise require, extrinsic evidence of a statement made by a witness that is inconsistent with any part of his testimony at the hearing shall be excluded unless:
  (a) The witness was so examined while testifying as to give him an opportunity to explain or to deny the statement; or
  (b) The witness has not been excused from giving further testimony in the action.