Maryland Code, Labor and Employment § 9-220

(a)(1) Each auxiliary police officer for Baltimore County is a covered employee while on duty as defined in the Baltimore County Police Manual of Rules, Regulations, and Procedures.

(2) Each auxiliary police officer for Howard County is a covered employee while on duty as defined in the Howard County Police Department's General Orders.

(b)(1) Except as provided in paragraph (2) of this subsection, each member of a volunteer police department is a covered employee.

(2) A member of a volunteer police department in Allegany, Carroll, Cecil, Charles, Garrett, Queen Anne's, St. Mary's, Somerset, Washington, or Worcester County is not a covered employee.

(3) For the purposes of this title, the political subdivision of the State where the department is organized is the employer of the covered employee in the department.