I would copy and past some part of California's law...........
MISDEMEANOR EXPUNGEMENTS
If you have been convicted of a misdemeanor, that conviction is going to remain on your record forever. It is not something that magically falls off of your record after a certain number of years. However, with the help of WILL & WILL, LLP, there is something you can do about cleaning up your criminal record. Pursuant to California Penal Code section 1203.4, a misdemeanor conviction can be expunged once you have successfully complete all the terms of your probation. If you pled guilty or no contest to an offense but were granted a terminal disposition (i.e., were not placed on probation), your conviction can be expunged one year after the date you pled guilty or no contest. Although successful completion of probation is a requirement, the law provides courts the discretion to expunge convictions where probation was violated, but later completed successfully.
Once your criminal conviction has been expunged, you can legally answer "no" to direct questions of whether you were convicted of that crime. There are 3 exceptions to this general rule: 1) in an application for peace officer or public office, 2) in an application for a state license, or 3) contracting with the California Lottery Commission. In all other cases, you can deny the conviction. Furthermore, certain licensing agencies like the Department of Real Estate require that you expunge your record as a criteria for licensing.
Let me know if you have more question...........The above hopefully explains everything.......Yes you can expunge it from what I researched........