California Code, Evidence Code - EVID § 1294

(a) The following evidence of prior inconsistent statements of a witness properly admitted in a conditional examination, preliminary hearing, or trial of the same criminal matter pursuant to Section 1235 is not made inadmissible by the hearsay rule if the witness is unavailable and former testimony of the witness is admitted pursuant to Section 1291:

(b) The party against whom the prior inconsistent statements are offered, at his or her option, may examine or cross-examine any person who testified at the conditional examination, preliminary hearing, or prior proceeding, as to the prior inconsistent statements of the witness.

(c) As used in this section, “conditional examination” has the same meaning as in Chapter 4 (commencing with Section 1335) of Title 10 of Part 2 of the Penal Code.