Labor Code section 432.7 already prohibits both public and private employers from asking applicants for employment to disclose information relating to arrests and detentions that did not result in a conviction. This section also prohibits employers from asking about judicially dismissed cases or convictions that have been dismissed. Dismissal include those pursuant to Penal Code sections 1203.4, 1203.4a, 1203.45, and 1210.1. There are certain exceptions such as law enforcement related employment.
Now, Labor Code section 432.9 prohibits state and local agencies from asking applicants for employment about convictions histories until the agency determines if the applicant meets the minimum employment qualifications. Of course there are still exceptions such as law enforcement related employment.