47 CFR 95.183 - Prohibited communications.
(a) A station operator must not communicate:
(1) Messages for hire, whether the remuneration received is direct or indirect;
(2) Messages in connection with any activity which is against Federal, State, or local law;
(3) False or deceptive messages;
(4) Coded messages or messages with hidden meanings (“10 codes” are permissible);
(5) Intentional interference;
(6) Music, whistling, sound effects or material to amuse or entertain;
(7) Obscene, profane or indecent words, language or meaning;
(8) Advertisements or offers for the sale of goods or services;
(9) Advertisements for a political candidate or political campaign (messages about the campaign business may be communicated);
(10) International distress signals, such as the word “Mayday” (except when on a ship, aircraft or other vehicle in immediate danger to ask for help);
(11) Programs (live or delayed) intended for radio or television station broadcast;
(12) Messages which are both conveyed by a wireline control link and transmitted by a GMRS station;
(13) Messages (except emergency messages) to any station in the Amateur Radio Service, to any unauthorized station, or to any foreign station;
(14) Continuous or uninterrupted transmissions, except for communications involving the immediate safety of life or property;
(15) Messages for public address systems.
(b) A station operator in a GMRS system licensed to a telephone answering service must not transmit any communications to customers of the telephone answering service.