Md. Code, Local Government § 9–312

(a) Except as provided in subsection (b) of this section, a public local law

enacted by the county commissioners of a code county takes effect:

(1) 45 days after it is enacted; or

(2) at a later date specified in the public local law.

(b) (1) A public local law takes effect on the date of its passage if it is

passed as an emergency bill.

(2) An emergency bill may not:

(i) abolish or create an office;

(ii) change a salary, term, or duty of an officer;

(iii) grant a franchise or special privilege; or

(iv) create a vested right or interest.