Maryland Code, Labor and Employment § 9-223

(a) An individual is not a covered employee if the individual is eligible under a federal law, other than the Social Security Act,  1 for benefits for an accidental personal injury or occupational disease.

(b) An individual for whom federal law provides a rule of liability for injury or death is not a covered employee.

(c) Notwithstanding subsections (a) and (b) of this section, if an individual for whom federal law provides a rule of liability or method of compensation and the employer of the individual engage both in intrastate commerce and in foreign or interstate commerce, the individual is a covered employee when engaged in intrastate commerce to the extent that the mutual connection of the individual and the employer with intrastate commerce is clearly distinguishable and separable from foreign or interstate commerce.