Maryland Code, Transportation § 21-206

(a) A person without lawful authority may not willfully alter, or interfere with the operation of, any traffic control device or any railroad sign or signal, including any inscription, shield, or insignia on it.

(b) A person without lawful authority may not willfully deface any traffic control device or any railroad sign or signal, including any inscription, shield, or insignia on it.

(c) A person without lawful authority may not willfully injure any traffic control device or any railroad sign or signal, including any inscription, shield, or insignia on it.

(d) A person without lawful authority may not willfully knock down any traffic control device or any railroad sign or signal, including any inscription, shield, or insignia on it.

(e) A person without lawful authority may not willfully change the direction of any traffic control device or any railroad sign or signal, including any inscription, shield, or insignia on it.

(f) A person without lawful authority may not willfully twist any traffic control device or any railroad sign or signal, including any inscription, shield, or insignia on it.

(g) A person without lawful authority may not willfully remove any part of any traffic control device or any railroad sign or signal, including any inscription, shield, or insignia on it.

(h) A person without lawful authority may not possess, with an intent to use, any device capable of transmitting an infrared, electronic, or other signal to a traffic control device or a railroad sign or signal for the purpose of altering or otherwise interfering with the operation of the traffic control device or a railroad sign or signal.

(i) A person convicted of a violation of this section is subject to imprisonment not exceeding 2 months or a fine not exceeding $500 or both.