Interrogatories are one form of discovery in a lawsuit. An interrogatory is a written question from one party to the lawsuit to another party to the lawsuit.You cannot send more than 30 questions to another party in a circuit court case. The Maryland Rules have form interrogatories that you can use as an example. Instead, you will only file the "Notice of Service of Discovery Material" that you sent to the opposing party with the court. The judgment creditor served interrogatories on the judgment debtor . Maryland Rule 2-421 governs the manner in which Maryland personal injury attorneys may ask and answer interrogatories. Most forms used in the District Court are contained in this index. Interrogatories are written questions that a litigant serves on the other party. The other party must answer these questions within 30 days.