Lie detector

We often hear about the lie detector tests. Some people have seen it in investigation movies, while some might have also gone through it. It basically is a technological gift, that allows the investigating authorities to have a clear idea about the truth that’s lies behind a half true or misleading information provided. It is also known as a polygraph test, which is used to simply know whether a person is lying or telling truth in relation to the questions put in front of him. The results of the lie detector tests do depend on multiple factors or response from the body, these factors include;

  • The breathing rate of subject
  • The pulse of the subject
  • The blood pressure of the subject
  • The perspiration of the subject
  • The leg and arm movement of the subject (this happens only in some cases)

(Here subject is the person who is going through the lie detector test)

Lie Detector Test


There’s a standard procedure followed, this doesn’t completely changes from one test organiser to the other. There might be minute changes registered between the ways adopted by different people, but the base remains the same. Let’s understand the same in detail;

  • Before the targeted questions are put, the subject is asked 3-4 general questions so that the person’s signals could be recorded and monitored. After that the real questions are asked.
  • Through the process is on, the signals are recorded in a moving paper.
  • After the process culminates, the examiner examines the signals recorded on the moving paper. This is compared with the signals that were recorded while the questions we not put. And then the examiner finds whether or not there have been any major changes in the signal.
  • A change in the signal is the real indication of the person lying on the questions asked.

How authenticate are the results?

As per the progressive reports developed from  lie detector tests  in the past few years, it has been concluded that the test does not delivers 100% authentic results in all the cases.

Different professionals conduct the overall procedure different, and the subjects put into interrogation also differ in the way they react to truths and lies. Thus the results vary from one person to another. While in one case it might bring out purely authenticate results, in the other case the results might vary in terms of its authentication.

Finding a right candidate for the vacant position in company is the responsibility of HR department in a company. Society of Human resource management gives statistics that more than 50% lie on the resumes while applying for job. So now a days recruitment process has changed completely by not only finding right person by conducting interview but also back ground verification and the facts verification which they declared while applying job. In this process lie detector or poly graph helps them extensively. It is required in present days of fraud and fake world that recruiters equipped with modern technology to recognise them.

Rise in fraudulent applications

Internet gives hundreds of options to get fake degrees or fraudulent certificates. It also provides smart ways to put misguided information on resume. The manipulations and liars have been in rise in the modern day job seekers. There are also fake universities and fake diplomas issued by them in the market. This phenomenon is not only at entry level but reached till CEO level (for ex: ousted yahoo boss). If a company HR team is not alert, such frauds and liars enter the staff. It causes loss of team morale ultimately reputation and financial loss to the company. To avoid such situations, professional lie detector exams are conducted.

Polygraph test process

If a candidate is avoiding the test and unpleasant situation would not get into fake business. Rather than having direct polygraph test, there are simple tips where resume itself hints about fake details.

lie detector

 The recruiter’s common sense would play major role in picking right candidate with real details and discarding fake ones. Just checking the contradictory facts will lead in a good way even in case of employment gap cover up.  Another option is to have a separate application form rather than having only CV in which all the details asked to candidate extensively. Here there is less possibility of faking the details. Allowing candidate to talk more in the interview process will also catch falsified information.

If these tips did not work out in recognizing the fake candidate, there is only way called lie detector test. Several private agencies like liedetectoruk offer experienced and professional examiners. After the test they provide authenticity of candidate along with evidence to support them. They also provide additional information so that HR teams could take a right decision.

The polygraph or lie detector test claims 98% accurate results in the test. The test is performed based on questionnaire prepared based on personal information, experience and possessed degree.The only answers permitted were “yes or no” and narrative answers are not permitted. The length of question should not be more than 5 seconds. This process is completely legal.