Prepare the Certificate of Service. Be sure to sign your responses.Fill in the "certificate of service" on the last page before mailing them back to the other side. A party may serve on any other party no more than 40 written interrogatories, including all discrete subparts. Nevada Rules of Civil Procedure Rule 33 allows for written Interrogatories as one method of finding (or Discovering) information relevant to a civil lawsuit. Service may be completed in person, through mail delivery, or electronic service. Click to find the Nevada Forms Legal Database. Certificate for Attendance of Out-Of-State Witness - CAOW (CIV). For information about how to fill out and file court forms, read Basics of Court Forms and Filings. If personally served, responses to interrogatories are due within thirty (30) days of service.