I had a friend that worked for a drug store. Turns out there was money missing so all employees were given a polygraph. My friend failed it. Now she was the most honest person I have ever known. She took several and still fllunked them.
As it turned out the question she failed on was - have you ever taken anything from the store without paying for it. She said 'No'. But, as it turned out the druggist would mix up medicine for employees for their children, etc. and not charge them for it. When she said 'No' to the question, subconsciously she was thinking of the free medicine and the answer showed deceit. Even though she had not taken anything from the store without paying for that was given to her 'free'. So, a lot depends upon not only the question, but what context the question was asked. the man that gave her the test told her he had never had anyone show such honesty even though it was subconscious.
I am sure questions are asked in a tricky manner. But, once having failed a test I might be leary of taking another one too. Especially if I was telling the truth. I just don't know. What was the question that BD showed deceit on, does anyone know. tia