Two years. You still have time.
Be sure to first ask the arresting authority to agree to such relief before filing your petition with the court. I have one of these petitions pending right now in the East LA court.
You still qualify for relief since it has not been two years since your dismissal. But I definitely agree that you should petition the arresting agency first. Many times talking with them is a quicker and less time consuming way to get this incident off your record.
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Contact your attorney. Good luck.
The response above is not intended as legal advice since it’s impracticable to provide thorough, accurate advice based upon the query without additional details. It is highly recommended that one should seek advice from a criminal defense attorney licensed in your jurisdiction by setting up a confidential meeting. Moreover, this response does not constitute the creation of an attorney-client relationship since this message is not a confidential communication because it was posted on a public website, thereby publicly disclosing the information, which is another reason to setup a confidential meeting with an attorney.