Countermeasures
This page explains a couple of the possible ways to fool a
polygraph test.
Charm the Examiner
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One way to lie during a polygraph test and get away with it
is to stay calm and charm the examiner. It is suggested that
you get a good night's rest before the test, be nice to the
polygraph examiner, develop a rapport, be cooperative, and
maintain your calm. Confidence and a friendly relationship
with the examiner, where you make him/her feel like you like
him/her (Weiner).
Stimulate the Truth
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Another way to fake the truth is to mentally prepare yourself
for the questions and work yourself up for the questions you
answer truthfully. Basically, during the preliminary
interview, take note of all relevant questions. Once the
polygraph test has started, you artificially increase your
heart rate and breathing for the questions that you answer
truthfully. This can be done by thinking of something
scary/exciting or by pricking yourself with a pointed object
concealed somewhere on your body. Then when the examiner asks
a relevant question, you stay calm and lie. This works because
even if your heart-rate and breath-rate increases during the
lie, it just seems normal because the polygraphs readings were
so high for the diagnostic questions (Maschke).