According to Goodson, some people who are telling the truth can fail polygraph tests by trying too hard to control their bodys responses. A 2011 meta-analysis by the American Polygraph Association found that polygraph tests using comparison questions had incorrect outcomes about 15% of the time.
Can you fail a lie detector test even if you are telling the truth?
You can fail the test simply because you dont quite understand the question, or over-analyze the question each time, even if the examiner gave you clarification multiple times. You tell the examiner, and they just say its not something to worry about, that the question does not refer to them.
What causes you to fail a polygraph?
Lie Detectors have Error Rates. There are two reasons why people fail lie detection tests: The person is guilty and is lying about the issue under investigation. The person is innocent but reacted similarly to persons known to be guilty, based on scientific research studies.
Is it possible to lie and pass a polygraph?
Yes, it is possible to lie and pass a polygraph. Then dont bite your tongue when actually lying on the real questions and itll come across as the truth. According to Tice (2012), daydreaming while answering questions can help too, as it distracts your mind from the pressure.
Does caffeine affect a polygraph?
Many applicants worry that something like caffeine will hinder their performance on the polygraph. But its more likely to hurt you if you drink a cup of coffee every morning, and then skip it the morning of the polygraph. The same goes with prescription medications.