The law calls it "serving" discovery. It is not like serving court papers.__ Step 5: File your Proof of Service and, if it applies, Declaration: Personal Service Could Not Be Made in Washington. You can, but do not have to, file a Proof of Mailing or Hand Delivery with the court so you have a record that the other party received your discovery requests. Discovery is an important part of the civil litigation process. It's how the parties determine what facts, evidence, and other information are available. All forms are available in PDF format unless otherwise noted. The Court recommends opening PDF forms with Adobe Acrobat Reader. Parties should not file a separate proof of service document unless it is necessary. I filed for a CIR in Wa state, I have been tryin to get the discovery process done I have sent first interrogatories and.