To use the analogy by Mr. Angus earlier, those in grade 4 probably will be already aware of that. But those of us who have long since passed grade 4 may need to be told that. Maybe there needs to be a caution to witnesses, but I doubt that. If we're all in the real world, we know—or most of us do—what can become of recordings of testimony.
On February 26th, 2009. See this statement in context.