Md. Code, Pub. Safety § 6-602

(a) A person may not willfully interfere with or obstruct the State Fire Marshal, a deputy State fire marshal, or a special assistant State fire marshal while the State Fire Marshal, deputy State fire marshal, or special assistant State fire marshal: (1) is fighting a fire, performing emergency service, or proceeding to a fire or other emergency; or (2) is dispatched on a call for emergency service. (b) A person may not willfully interfere with or obstruct the State Fire Marshal, a deputy State fire marshal, or a special assistant State fire marshal in the course of conducting an inspection or investigating a fire or explosion. (c) A person may not, with fraudulent design on person or property, falsely represent that the person is a State fire marshal or a sworn employee of the office of State Fire Marshal. (d) A person may not have, use, wear, or display without proper authority, for the purpose of deception, a uniform, shield, button, ornament, identification, or shoulder patch, or a simulation or imitation of these articles, adopted by the office of State Fire Marshal. (e) A person who violates this section is guilty of a misdemeanor and on conviction is subject to imprisonment not exceeding 3 years.