If an interview goes in directions you dislike, it is your right to terminate it. Don't say something to a reporter if you do not want it to appear in print or be broadcast. Long rambling answers require the reporter to cut and prune in ways that you may not like. Answer a reporter's question as accurately and as succinctly as possible. Help reporters understand the story.
Most reporters are generalists who are required to cover a variety of subject matter.
Offer background if it becomes clear a reporter lacks under-standing on an issue. If the reporter makes an erroneous statement, gently but firmly correct it. Keep the audience in mind. This means avoiding jargon and technical language. Offer written statements or documents as background.