I always found myself trying to outsmart the psych tests. Don't know if I did or not. Asking the same question three different ways is annoying at best.
Polygraph? No thank you. One of my partners was a very experienced polygrapher for ATF and then our outfit. I asked him to hook me up once while he was getting set up for an important session with a criminal defendant.
I told him I would answer absolutely honestly, (other than on baseline questions where he wanted me to fib), as long as he didn't ask anything too incriminating, and the results would remain private.
I answered completely honestly where applicable and it still showed (probable) "deception" on a couple of questions.
Yeah, I was cured of any further curiosity about potential results thereafter.