The Snohomish County prosecuting office told me something similar about discovery over the phone. I called 8/5/2015 to ask where to drop off a discovery request for a traffic infraction, and their response was "We are happy to accept anything that you drop off, but we no longer participate in that process." I re-phrased the question a little, and they provided the same answer.
A few questions before I start assuming that I will be able to get the case dismissed:
1) The infraction was issued by WSP while I was driving in Snohomish county. I believe since it was WSP, is it the county prosecutor that is responsible for the case? I.e. not a municipal prosecutor/etc. I want to ensure I delivery my discovery request to the right office...
2) Discovery requests are required to be submitted 14 days prior to hearing. Since IRLJ 3.1(b) doesn't state 14 "business" days, I assume it means 14 calendar days. Does anyone know which one it is?
3) What do I say in court (verbatim, please) if I motion for suppression, and then for dismissal?
My guess is for suppression is: "Your honor, I move for suppression of all evidence(?) per IRLJ 3.1(b). A discovery request was issued to the prosecuting office on [insert date], and filed with the court the same day, and I received no response."
For dismissal, I have no idea.
Any help is much appreciated, thank you!

