My client asked for my advice. I told her to send the agent a letter, explaining that she would be happy to consider answering any questions he might have, but only if he would extend her the minimal courtesy of putting those questions in writing, so that she could also put her answers in writing. What on earth would be so unreasonable about a request like that? Nothing at all. It would enable this woman to think carefully about her answers, possibly obtain the assistance of a lawyer, and check her records to make sure that her answers were accurate. It would also eliminate the very terrible danger, discussed at great length in this book, that the agent might later unintentionally misquote her in ways that could make her statements sound more damaging than they really were. The request was perfectly reasonable—and, I might add, it was exactly what any federal agency will tell you to do if you want to get important information out of them.
James Duane in You Have the Right to Remain Innocent