The FBI, to its credit in a self-serving sort of way, rejects the routine use of the polygraph on its own people.
We, of course, have the power of hindsight in our arsenal, but people living in Berlin in that era didn't. What would that have been like as this darkness fell over Germany?
The deadlines are much, much longer with books. When I was a reporter, a lot of times I'd come in at 8:30 a.m., get an assignment right away, interview somebody, turn the story in by 9:30, and have the finished story in the paper that landed on my desk by noon.