Interrogatories are a discovery tool (among many) used in lawsuits in New York courts. In sum, these are written questions seeking specific information.In many civil actions, before the case is resolved there takes place a process known as pretrial discovery. This summary describes the process. As the others have said, you do not file them with the court. The providing of legal papers to other parties in a case is known as service. A certificate of service of the interrogatories must be filed, giving the date of service and the name of the party to whom they were directed. Fla. Service of interrogatories. Treatment for ESI provided in the new rules and case law. The Complaint stems from a prior representation Plaintiffs provided to Defendant and her co-defendants in a prior case (hereafter, the former lawsuit).