I have a bit of unpleasant news for you. You do have a criminal record stating that your charges in 2009 were dismissed due to completed Diversion Program.
In your case, each such matter must be disclosed during I-130 AOS based on your marriage to a US Citizen, however, please note that such admission of a crime of moral turpitude will be considered by the USCIS at the time of the interview.
Also, a certified case disposition in this matter must be obtained beforehand the interview.
I suggest to find a good immigration attorney in San Francisco to complete your AOS without potential adverse effect on your AOS.
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It will not make you inadmissible but you must disclose. Make sure you obtain certified copies of the record.
Luis A. Guerra, Esq.
Law Office of Luis A. Guerra, PA
4801 South University Dr., Suite 252
Fort Lauderdale, FL 33328
Law Office of Luis A. Guerra (954) 434-5800. This answer is of a general nature and should not be relied upon as final, nor is it intended as legal advice.
The I-485 form will ask if you have ever been arrested. You will need to tell the truth. Get a lawyer to help prepare a memo to attach to the form.
FORMER IMMIGRATION LAW PROFESSOR -- LEGAL DISCLAIMER: This answer is offered for informational purposes only. It does not constitute an attorney-client relationship.