The key word is expungement. These library resources contain information about the expungement of criminal records in the State of California:

• California Criminal Defense Practice, Reading Room (Main KFC1155 .C342) or electronically on the law library computers using Lexis Advance. See Volume 5, Chapter 103 Expungement of Criminal Records
• California Criminal Practice: Motions, Jury Instructions & Sentencing (Main KFC1155.A65 .R83 2004). See Chapter 59

To find information online about expunging criminal records, you can start at the “Cleaning Criminal Records” section of the California Courts Online Self-Help Center, click here.  More information about expungement as well as instructions for filling out the forms and a step-by-step guide walking you through the process can be found on the Sacramento County Public Law Library’s website, click here.