Did you know that polygraph simply refers to multiple writings? I thought you should know. Well, this comes about as a result of the various attributes of the body that are recorded concurrently using various devices. A private investigator may use either analog or digital devices to gather information about an individual in relation to a particular crime or treachery.


Heart, Skin And Blood

Before you undergo a polygraph test, it is good to have an idea of what this is all about. Most importantly, note that a lie detector is designed in such a way that it gathers physiological information concerning three main body systems namely the heart, skin and blood. The electronic sensors attached to the chest of the examinee will record respiration while the galvanic reactions of the skin will be recorded using adhesive electrodes attached to the fingers. Blood pressure, on the other hand, is measured and recorded using the blood pressure cuffs.

With these instruments in place, a subject is exposed to questioning while each instrument records a specific reaction to the various questions. The data collected is then analyzed by an expert to determine whether the victim lied or told the truth.


Polygraph Questions

As such, polygraph questions vary depending on the type of information required for confirmation. However, during the control questioning session, one is subjected to questions that have no relation to the case at hand. This is popularly referred to as Control Test Questions. These type of questions may directly touch on the victim’s private life and are meant to prepare him or her to what is to follow next.

In most cases, when dealing with a highly experienced private investigator, you will be taken through various sessions including a pre-test interview, chart gathering session and lastly, the test data analysis session. In the first phase, you will be required to fill in a form and ask any questions if any. At this juncture, you will have the opportunity to familiarize yourself with the whole polygraph test procedure.


Chart Collection Session

When it comes to the chart collection session, the person conducting the test will give and collect the lie detector charts. Depending on a number of issues and the technique used, the number of questions will differ. Bearing on the same, the person administering the test will scrutinize through the charts and give a verdict on whether there was deception or truth in the subject’s testimony. When everything is clear, the suspect will be offered a chance to elucidate on the physiological reactions relating to a particular or more of the questions asked during the interview.


What Are The Four Major Departments?

There are four major departments that make use of the lie detectors. These include the legal community, the private sector, law enforcement and government agencies. Besides, the corporate world has also embraced the use of polygraph testing as a way of screening their potential employees before they are hired. There is more you need to learn concerning polygraph testing and so we advise that you get in touch with us for uncertain enquiries.