Dumbass, you don't even know if you're lying or not. When an FBI agent is interviewing you, assume that that agent is exquisitely prepared. They probably already have proof about the answer of half the questions they're going to ask you. They have the receipts. They've listened to the tapes. They've read the emails. Recently. You, on the other hand, haven't thought about Oh Yeah That Thing for months or years, and you routinely forget birthdays and names and whether you had a doctor's appointment today and so forth. So, if you go in with "I'll just tell the truth," you're going to start answering questions based on your cold-memory unrefreshed holistic general concept of the subject, like an impressionistic painting by a dim third-grader. Will you say "I really don't remember" or "I would have to look at the emails" or "I'm not sure"? That would be smart. But we've established you're not smart, because you've set out to tell the truth to the FBI. You're dumb. So you're going to answer questions incorrectly, through bad memory. Sometimes you're going to go off on long detours and frolics based on entirely incorrect memories. You're going to be incorrect about things you wouldn't lie about if you remembered them. If you realize you got something wrong or that you may not be remembering right, you're going to get flustered, because it's the FBI, and remember even worse. But the FBI would never prosecute you for a false statement that was the result of a failed memory, right? Oh, my sweet country mouse. If you had talked to a lawyer first, that lawyer would have grilled you mercilessly for hours, helped you search for every potentially relevant document, reviewed every communication, inquired into every scenario, and dragged reliable memory kicking and screaming out the quicksand of your psyche.