Short summary: The FBI will take crappy notes (they are by policy not allowed to tape record the interview) about the interview which they will swear under oath are 100% correct and then use those “official” notes to blackmail you into cooperating.
Most MP3 players have a recoprd function, use it!!! Then hang the lying bastards with their own interview!!!
Seems like more and more the FBI is shooting fish in barrels rather than doing actual work involving burning up shoe leather....