You hear about lie detectors all the time in police investigations, and sometimes a person applying for a job will have to undergo a polygraph test (for example, certain government jobs with the FBI or CIA require polygraph tests). The goal of a lie detector is to see if the person is telling the truth or lying when answering certain questions.

When a person takes a polygraph test, four to six sensors are attached to him. A polygraph is a machine in which the multiple ("poly" signals from the sensors are recorded on a single strip of moving paper ("graph". The sensors usually record:

  • The person's breathing rate
  • The person's pulse
  • The person's blood pressure
  • The person's perspiration
Sometimes a polygraph will also record things like arm and leg movement.

When the polygraph test starts, the questioner asks three or four simple questions to establish the norms for the person's signals. Then the real questions being tested by the polygraph are asked. Throughout questioning, all of the person's signals are recorded on the moving paper.

Both during and after the test, a polygraph examiner can look at the graphs and can see whether the vital signs changed significantly on any of the questions. In general, a significant change (such as a faster heart rate, higher blood pressure, increased perspiration) indicates that the person is lying.

When a well-trained examiner uses a polygraph, he or she can detect lying with high accuracy. However, because the examiner's interpretation is subjective and because different people react differently to lying, a polygraph test is not perfect and can be fooled.


this was below this info::::::


Here is a hard, cold fact: You have a 50% chance of failing your polygraph test, just because you're nervous - even if you're telling the truth! 

But here is the good news: When you get properly prepared, you will be able to pass 100% of the time - nervous or not - lying or not - NO MATTER WHAT!

       Police polygraph expert Doug Williams will get you properly prepared to pass your polygraph test by teaching you;  (a) how the polygraph works, (b) how to manipulate reactions to the right questions, (c) how to avoid reacting to the wrong questions.  In other words, you will learn the right way to produce a perfect, truthful polygraph chart! is the exclusive source for all three elements necessary to insure you are properly prepared to always pass your polygraph test.


1.  An up-to-date, easy to understand manual with practice exams.

      You will quickly learn the right way to pass your test.  Doug's manual provides clear, simple, step-by-step directions in a few easy to understand pages.

       It goes way beyond so-called "countermeasures", and it is undetectable by the examiner because it simply teaches you exactly how to produce a perfect, realistic, truthful polygraph chart.  It is tested and proven to work on both the analog and the newest computer polygraph instruments.

       You will be taught how to always pass every type of polygraph and voice stress test - including pre-employment tests for POLICE, SHERIFF, HIGHWAY PATROL, FIREFIGHTER, FBI, SECRET SERVICE, CIA, NSA, DIA, (and all other local, state, and federal law enforcement and intelligence agencies), as well as periodic, criminal, specific issue, full scope, life style, probationary, and spouse/partner fidelity. 

      The manual also contains practice exams with current polygraph test questions for each type of test.  The manual tells you the questions you will be asked and tells you how you are to respond to each of the questions.

 interesting huh?