You send it to police agency. Hopefully they will respond . If you subpoena they will have to respond .
ANDREW ROBERTS CRIMINAL AND TRAFFIC TICKET DEFENSE ATTORNEY
you send it to the agency that wrote the ticket or the prosecutor's office that represents them.
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It would probably be your best bet to send the letter to the District Attorney's Office. If you call, you may be able find out which attorney would be handling your traffic case, and you can address the letter directly to them. Most likely, however, you will just have to show up on the day of your trial, and they will give you anything you have. Unfortunately, in these types of cases, there may not be much discovery you can get, but you should ask for maintenance and calibration records of the camera. It would probably be in your best interest to consult with an attorney who specializes in traffic cases.
Fill Out the Form CR-125, you can download it at: http://www.courts.ca.gov/documents/cr125.pdf
As long as you know when your trial or arraignment date is and there's sufficient time, you can either give it to the prosecutor or mail it to the cops directly, it will need to be a 3rd party that fills out the Proof of Service.