Md. Code, Labor and Employment § 5–402

Sections 5-404 through 5-409 of this subtitle do not apply to:

(1) a railroad that is subject to the Federal Railroad Safety Act of 1970 and the jurisdiction of the Federal Railroad Administration;

(2) a landfill in the State;

(3) a person who:

(i) is engaged in the business of providing commercial or residential garbage and refuse pickup and disposal service while actually engaging in the pickup and disposal of garbage and refuse; and

(ii) does not pick up, transport, treat, store, or dispose of controlled hazardous substances that are regulated under Title 7, Subtitle 2 of the Environment Article; or

(4) an analytical, educational, or research and development laboratory.