California has no program of "deferred adjudication", though there is a misdemeanor diversion process available under Penal Code sections 1001-1001.9. This is a uniform state-wide program and is not dependent on what county the offense was committed in.
Whether or not misdemeanor diversion will be granted is determined by the court, not the district attorney (who can oppose a grant of diversion, but cannot deny it). Upon request of a first offense misdemeanor defendant, the court will refer for a diversion eligibility report by the probation department and will usually follow the PO's recommendation to divert or not.
California has no process of "expungement". There is a process for sealing of criminal records under Penal Code section 851.8, subd. (b), but a grant of record sealing requires the court to make a finding of factual innocence, which would be most unlikely in this situation.
Under Penal Code section 1001.9, subd. (b), successful diversion does allow the person diverted to state that he was not arrested for the diverted offense, except in response to questions contained in applications for law enforcement positions.
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