FBI Doesn't Want Jurors To See How They Get Confessions
Psychological tricks like misleading or lying to a suspect in questioning or pretending to show the suspect sympathy might also offend a jury, the agency said. “Perfectly lawful and acceptable interviewing techniques do not always come across in recorded fashion to lay persons as proper means of obtaining information from defendants,” said one of the once-secret internal Justice Department communications made public as part of the investigation into the dismissals of the United States attorneys.
Interesting. So, they don't want jurors to see precisely what they do to obtain confessions because they think the jurors might find what they do "improper," even though it's not. Or, maybe, because the jurors, upon seeing the actual interrogation process, might be more inclined to believe defense assertions that the confession was false. It is very true that lying to suspects and applying extreme psychological pressure are "perfectly lawful," but it's also true that use of these techniques can result in false confessions, and that the average juror doesn't have an understanding of how these techniques play out. And the FBI doesn't ever want them to.