No. An expungement changes and updates the disposition of the case to reflect a dismissal under 1203.4 of the Penal Code.
This means the Court file, the California Department of Justice, and the FBI update their files to show a new plea of not guilty has been entered and the case has been ordered dismissed and set aside by the Court.
It does not remove all records of the case, nor does it make the conviction 'invisible' to background checks. The conviction is set aside, and the case dismissed by Court Order.
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