Find Your Court Forms. Contra Costa County District Attorney's Office, Martinez.Request the necessary forms for filing an affidavit of nonprosecution. Fill out the forms accurately and completely. Lawyers in Contra Costa County Will Assist with All of Your Legal Issues. Call us at or fill out the form below! "Jerry" Brown, Jr. appointed Leonard E. Marquez as a Judge of the Contra Costa County Superior Court on February 27, 2018. As you wake up and get ready for your day, the harsh reality hits you: you're facing criminal charges and need help. Self-Help Resources. Calendar of. Workshops.