The Maryland Notice of Lawsuit and Request to Waive Service of Summons (AO 398) is a document issued to a defendant in a civil lawsuit in the state of Maryland. It is a notice that informs the defendant of a pending lawsuit and requests that they waive service of summons. This document must be properly served to the defendant in order for the lawsuit to move forward. There are two different types of Maryland Notice of Lawsuit and Request to Waive Service of Summons (AO 398): the AO 398A and the AO 398B. The AO 398A is used for defendants who reside or are found in Maryland, while the AO 398B is used for defendants who reside or are found outside of Maryland. Both types of documents provide the same information to the defendant, including the name of the court, the case number, the plaintiff’s name, the defendant’s name, and a request to waive service of summons. The documents must be executed by the plaintiff and the defendant in order to be valid.