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RADIOS
28.15 (4) Radios, Compact Disk Players and other Sound-Emitting Devices without Earphones: No person except a peace officer, firefighter, District employee, or emergency response professional, in the course of employment, shall operate a radio, compact disk player, MP3 player, video player or other sound-emitting device, aboard any District Vehicle or in or upon any District Station, unless the only sound produced by such item is emitted by a personal listening attachment (earphone) audible only to the person carrying the device producing the sound.