I am trying to find out what law controls the discovery available for a trial in Ca on a speeding infraction. CVC 40901 only refers to testimony and business receipts and records. But it doesn't say specifically what law controls the discovery process. I especially want to know if you can serve the police officer with interrogatories, and also if you serve a subpoena duces takem and get the documents before trial (so you can review and analyze a head of time). Finally, how do you attack the radar maintenance before trial if you can't get the info through the discovery process? I want to know how good the radar documentation was before I even show up for the trial.