A few years ago, I read an interesting article. Can't remember the source or website, but I think it was a lawyer.The FBI has a firm policy against agents allowing their conversations with citizens to be recorded. The context of the article was about a technique of the FBI. The technique was to interview someone, while the FBI convinced the interviewee that the FBI would keep notes and send him a copy of the write-up later.Well, it turns out the write-up somehow always managed to subtlely shift what was said and agreed--to the citizen's disadvantage, of course. I do not recall the article claiming the regulation against agents allowing themselves to be recorded was put in place to facilitate this little game. But, it certainly helped the game along.