Cal. Bus. & Prof. Code § 25009

Any defendant in any action brought under this chapter or any person who may be a witness therein under Title 4 (commencing with Section 2016.010) of Part 4 of the Code of Civil Procedure or Section 776 of the Evidence Code, and the books and records of the defendant or witness, may be brought into court and the books and records may be introduced by reference into evidence, but no information so obtained may be used against the defendant or the witness as a basis for a misdemeanor prosecution under this chapter.