Md. Code, State Government § 17–108

(a) This section does not affect an appointment:

(1) of an officer who requires special knowledge or training; or

(2) to an office that requires expert knowledge or training.

(b) An individual may not be appointed to any office in the State unless the individual has been a bona fide resident of the State for at least 12 months before the day of the individual’s appointment.

(c) A State or county official may not appoint an individual unless the individual has been a bona fide resident of the State for at least 12 months and of the county in which the individual is appointed for at least 6 months before the day of the individual’s appointment.