part 97 for HAM radio has exceptions such as authentication purposes or for medical personnel. part 95 for FRS/GMRS says, (4) Coded messages or messages with hidden meanings (``10 codes are permissible);''

PART 95--PERSONAL RADIO SERVICES--Table of Contents

         Subpart A--General Mobile Radio Service (GMRS)

Sec. 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;

part 97 for HAM radio has exceptions such as authentication purposes. part 95 for FRS/GMRS says,

PART 95--PERSONAL RADIO SERVICES--Table of Contents

         Subpart A--General Mobile Radio Service (GMRS)

Sec. 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;