Md. Code, Land Use § 16-102

(a) The Commission shall implement a merit system adopted under this subtitle. (b) The merit system includes each employee of the Commission, except: (1) the commissioners; (2) the executive director, secretary–treasurer, and general counsel appointed by the Commission under § 15–109 of this article; (3) (i) the Inspector General; and (ii) any temporary term employee of the Office of the Inspector General appointed under § 15–503 of this article; (4) a part–time or temporary employee under Subtitle 2 or Subtitle 5 of this title; (5) in Montgomery County, each position excluded under § 20–204(b) of this article; and (6) in Prince George’s County: (i) the deputy chief of park police as provided in § 17–305 of this article; and (ii) each director and deputy director as provided in § 20–204(c) of this article.