The request for admission represents the last step in a current discovery strategy. Peggy Kerley, Joanne Banker Hames, Paul A. Sukys, Civil Litigation 13-1 (8th ed. 2019). "The request for admission stands as the final weapon in your attorney's discovery arsenal." Id. at 13-1. It is a petition that is filed by one party in a lawsuit to another. Id. at 13-1a. It is, "asking the second party to admit to the truthfulness of some fact or opinion." Id. at 13-1a. "According to Rule 36 of the Federal Rules of Civil Procedure, a request for admission may be served on any party in a lawsuit but may not be served on a nonparty." Id. at 13-1a