Re: Subpoena Duces Tecum
Actually, for criminal matters (California traffic infractions are treated as criminal matters) the proper procedure to follow would be to file a "motion to compel" with the traffic court and serve a copy of it on the DA & the CHP. (See California Penal Code Section 1054.5).
You can search the forums here for "motion to compel" and you'll find a number of discussions about the topic.
And yes, even with a motion to compel, you might find yourself having to review the information at or shortly before your trial. You can ask the judge for a continuance but the amount of time he might grant might not be that long as that may interfere with your right to a speedy (45 day) trial from your arraignment date.
Why don't you share the details of when you were cited and/or what it is you are hoping to uncover from the discovery material you requested... We maybe able to clarify matters for you one way or the other!
I am right 97% of the time... Who cares about the other 4%!