Hello,

I just started my career as a Sci-Fi writer (please don't mock me) and, after some chapters, found it could be useful for one of my characters to take a polygraph test.
It takes place in a sort of post-acapolyptic background, so it hasn't to be perfectly accurate in every detail, but still I'd like to it to be realistic and believable.

Right now my biggest concerns are: how many control and irrelevant questions should I add for every relevant one? Are they just scattered along the interrogation or should be placed at regular intervals? How many times can I ask the same question?
Probably I'm going to have some further questions, as they'll come to my mind.

Unfortunately I'm not a big police TV shows fan, but if you can point me toward a show' specific episode which could be a nice example it'll be fine anyway, even if English is not my main language.

Thanks in advance.

I already downloaded the PDFs yesterday (and some more of them) but didn't know the video.
Thank you.