Polygraph examiners are highly analytical people with excellent interpersonal communication skills. They combine knowledge of psychology and physiology to evaluate individuals for deceptive tendencies. The work can be fascinating and intellectually stimulating.
In short, polygraph tests record a number of different bodily responses which can then be used to determine whether someone is telling the truth. So polygraph tests do not measure deception or lying directly, but rather possible signs that a person could be deceiving the interviewer.
The Polygraph Exam ProcessThe polygraph instrument measures multiple vital signs to indicate whether someone is being deceptive. The polygraph examiner looks for changes in blood pressure, heart rate, respiration, perspiration, and skin conductivity.
He must be an impartial seeker of truth by conducting examination in a professional and ethical manner, and never allow prejudice to influence the result of the examination.
Requirements to Become a CIA Polygraph ExaminerThey must also possess a bachelor's degree or higher from an accredited college or university. Candidates must have earned, at a minimum, a 3.0 GPA and have an exhibited an interest in polygraph examiner work.
They estimate the accuracy of the polygraph to be 87%. That is, in 87 out of 100 cases, the polygraph can accurately determine if someone is lying or telling the truth.
The Polygraph Pre-InterviewPrior to actually being given the exam there will be a pre-test interview and typically you'll be asked questions for about 20 to 30 minutes. The questions will focus on a variety of things such as your previous employment history, driving record, drug use, and criminal history.
Polygraph examinations often include a procedure called a "stimulation test," which is a demonstration of the instrument's accuracy in detecting deception. Several questioning techniques are commonly used in polygraph tests. An alternative polygraph procedure is called the Guilty Knowledge Test (GKT).
The National Center for Education Statistics indicates it takes an average of 52 months to complete a bachelor's degree program from first enrollment to degree completion. This is about one semester longer than four years. The range is typically between four and six years.
Even if the practice of lying detector testing fascinates everyone, after almost a century of scientific research, the veracity of the results of polygraph tests cannot be confirmed. Thus, you can fail a lie detector test if you are nervous, calm or even if you didn't know you were taking a lie detector.
The first reason is that an innocent person can fail a polygraph test. A second reason why you shouldn't take a polygraph test unless your lawyer advises doing so, is that polygraph results are generally inadmissible in court.
Polygraph operators claim that the polygraph is 95 to 100 percent accurate as a lie detector. In order for that to be true, every single time your heart starts to beat fast, your breathing becomes erratic, your blood pressure increases and the sweat activity on your hand increases… you have lied.
Refusing a polygraph is not going to make a difference in how the police officers or the prosecutor view your innocence or guilt. Remember, a police officer does not need to tell you the truth. Even if you pass the test, the officer may lead you to believe you failed.
Because the results of a polygraph test can mean many things and are so unreliable in detecting actual lies, they do not rise to the level of reliability required for scientific evidence in a courtroom and polygraph test results are usually inadmissible as evidence.
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When considering the effect of drugs on the polygraph, the Federation of American Scientists reported that “the tranquilizer, meprobamate (“Miltown”), permits subjects who are being deceptive to increase their ability to avoid detection in a polygraph examination.” This drug and other anti-anxiety medications or
No matter what tactics the police use against you, you are fully within your rights to refuse a polygraph test at any stage of the criminal justice process. If you ever find yourself in one of those dimly lit rooms, you should politely decline to participate until you've discussed the matter with a qualified attorney.
Polygraph can only be done in person. Do not fall for the "over the phone" scams that are advertised on the internet. Those services will be much less expensive than polygraph testing, but there is not a single independent scientific study that supports "voice stress" technology.
