Maryland Code, Transportation § 8-647

(a)(1) A person may not remove any dirt, sand, gravel, stone, rock, or other material from the land adjoining any State highway, if the removal affects the surface or construction of the highway by changing the supporting slopes in a fill or the slopes supporting the adjoining land in a cut.

(2) If the Administration has built up barriers to protect or support any highway, such as sand fences, retaining walls, or any other structure, a person may not remove any dirt, sand, gravel, stone, rock, or other material from the land adjoining the highway, if the removal is harmful to the construction or protection of the highway.

(1) For a first offense, a fine not exceeding $100; and

(2) For any subsequent offense, a fine not exceeding $1,000 or imprisonment not exceeding 6 months or both.