Expungement in California generally refers to setting aside and dismissing a conviction on one's record. It can also include reducing a felony conviction to a misdemeanor conviction pursuant to California Penal Code § 17(b); sealing and destroying a juvenile record; and searling and destroying an arrest record.
A felony conviction that resulted in an actual prison time cannot be reduced to a misdemeanor or set aside and dismissed. Upon successful completion of a probation after felony conviction(s), a felony may be reduced to a misdemeanor and/or expunged. If the person is still on probation, s/he can petition to terminate it early, pursuant to California Penal Code § 1203.3.
The Court must grant a petition for expungement if probation has been successfully completed or terminated early. If probation was violated or another offense was committed during probation, the Court may grant a petition for expungement "in its dicretion and in the interestes of justice". See People v. Hawley (1991, Cal App 1st Dist) 228 Cal App 3d 247, 278 Cal Rptr 389.
Applicants should obtain court files for all criminal convictions before filling out a petition. For more detailed informaiton on how to obtain a relief under California Penal Code §§ 1203.4, 1203.4a, refer to our training page.
Certificate of Rehabilitation is a judicial finding that the individual has been rehabilitated. Its legal effect for employment is as limited as a § 1203.4 dismissal, as criminalconvictions still remain on one's record.
Pardon's legal effect is as limited as that of Certificate of Rehabilitation. The only substantial differences are restoration of firearm rights and waiver of the requirement to register as a sex offender.
For more information, visit California Courts: Self-Help Center: Clean Up Your Criminal Record
and Los Angeles County Public Defender's Office: FAQ.--Wiping the Slate Clean.