Md. Code, Public Safety § 2–403

(a) Each police employee, including an individual who is appointed to the Department for training before regular assignment as a police employee, shall remain in probationary status for a period of 2 years after the date of appointment to the Department.

(b) Each civilian employee shall remain in probationary status for the period required under Title 7, Subtitle 4 of the State Personnel and Pensions Article.

(c) Each deputy State fire marshal, including an individual who is appointed to the Office of the State Fire Marshal for training before regular assignment as a deputy State fire marshal, shall remain in probationary status for a period of 2 years after the date of appointment to the Office of the State Fire Marshal.