Lie detector test – What happens

What is a lie detector test?
As the title suggests your heart rate and pupil are monitored to see if you are lying. Your heart will beat faster if a question you are asked shocks you and your pupil will also widen. Lie detector tests are performed for a whole range of reasons; it can be for a criminal who won’t confess to a crime, an unfaithful partner or a pre-employment check. Contrary to what you see on the TV you now know that a lie detector test is not just for cheating partners.

Lie detector test cost?

The cost of a lie detector cost can vary from region to region and how experienced the examiner is. You can expect to pay from £500 and more if the tester will have to travel far to reach you. You can meet at the office if it’s a company or at a hotel or meeting room if the examiner is freelance. If the lie detector test is for a personal issue the examiner can travel to your home if preferred.

How does the lie detector work?
The whole thing can take up to 3 hours or more depending on the reason for the test, the most time consuming is the pre test interview and the questions to be asked. The examiner will need to hear the whole story before conducting the test and will then come up with a list of questions to determine whether or not the person is lying. The examiner will also explain how the test works and give you the opportunity to ask any questions. All answers should be answered with a simple yes or no; by hesitating and saying anything other than this you may affect your result.

The set of questions will be asked 3-4 times to get an accurate reading, during this process you will also be given the opportunity to confess to anything you may have done. You will be asked to sit on a chair facing away from the examiner with your hand resting on a table. You may have a camera pointing to your eye to check pupil responses. A finger plate may be clipped on the forefinger to measure pulse and tubes may be placed on the chest area to record breathing.

Before the examiner gives an answer the results of the chart will be reviewed, if there is any doubt the examiner may consult another examiner for a second opinion but in most cases an answer is given straight away.