49 C.F.R. § 1503.103
In addition to the terms in §1500.3 of this chapter, the following definitions apply in this part:
Administrative law judge or ALJ means an ALJ appointed pursuant to the provisions of 5 U.S.C. 3105 .
Agency attorney means the Deputy Chief Counsel for Enforcement or an attorney that he or she designates. An agency attorney will not include-
Attorney means any person who is eligible to practice law in, and is a member in good standing of the bar of, the highest court of any State, possession, territory, or Commonwealth of the United States, or of the District of Columbia, and is not under any order suspending, enjoining, restraining, disbarring, or otherwise restricting him or her in the practice of law.
Enforcement Investigative Report or EIR means a written report prepared by a TSA Inspector or other authorized agency official detailing the results of an inspection or investigation of a violation of a TSA requirement, including copies of any relevant evidence.
Mail includes regular First Class U.S. mail service, U.S. certified mail, or U.S. registered mail.
Party means the respondent or TSA.
Personal delivery includes hand-delivery or use of a contract or express messenger service, including an overnight express courier service. Personal delivery does not include the use of Government interoffice mail service.
Pleading means a complaint, an answer, motion and any amendment of these documents permitted under this subpart as well as any other written submission to the ALJ or a party during the course of the hearing proceedings.
Properly addressed means a document that shows an address contained in agency records, a residential, business, or other address submitted by a person on any document provided under this part, or any other address obtained by other reasonable and available means.
Respondent means the person named in a Notice of Proposed Civil Penalty, a Final Notice of Proposed Civil Penalty and Order, or a complaint.
TSA decision maker means the Administrator, acting in the capacity of the decision maker on appeal, or any person to whom the Administrator has delegated the Administrator's decision-making authority in a civil penalty action. As used in this part, the TSA decision maker is the official authorized to issue a final decision and order of the Administrator in a civil penalty action.
49 C.F.R. §1503.103