Md. Code, State Personnel and Pensions § 12–103

(a) An employee with a grievance or the grievant's representative may present the grievance free from coercion, discrimination, interference, reprisal, or restraint.

(b) Unless another procedure is provided for by this article, the grievance procedure is the exclusive remedy through which a nontemporary employee in the State Personnel Management System may seek an administrative remedy for violations of the provisions of this article.