We offer both Voice Stress or/and Polygraph testing for fast accurate
and reliable results.
The best testing method is a combined technique called
With Polygraph we test the person's autonomic nervous
system and with Voice Stress we test the central nervous system.
The PolyStress technique test both nervous systems simultaneously thus
having a lot more reliable result.
There is a specific method to do this test to be able to relay on the
result as it differ from both Polygraph and Voice stress. Only the
examiners listed on the APAVSA
website have been
trained in the technique and can use and report on it. It is not merely
doing two different tests or using both techniques at the same time.
This is a very advanced test method and should not be attempted by
examiners not purposely trained and qualified.
Our experience is that most of the Industry is moving away from the old
Polygraph testing method to the Voice Stress method as it is more
hygienic, less intimidating and more subject friendly.
We would not like to get involved in the senseless
arguments between the VSA and Polygraph industries. We use both methods
and both methods carry merit.
Areas of operation:
We need properly qualified and able examiners in:
- Eastern Cape
- KwaZulu Natal
See some of the factual difference between the two
||Voice Stress (CNS)
|Intrusive physiological attachments(Painful at
|Old science (80 years)
||Modern science with space age technology.
||ONLY Countermeasure is Silence
||Non Hostile Techniques
|30-60% “Inconclusive” Results
||No “Inconclusive” Results
|Drugs, Age & Health can skew results
Not affected by Alcohol, Drugs, Age or Health
|“YES” & “NO” Answers
||Narrative answers acceptable
|Test limited to 8-14 questions
||Unlimited questions in test
|Must sit motionless
|Totally Analogue or with Computer to display
||Totally Digital (64 bit). Proprietary algorithms.
Since about 82% of all people we have
tested are innocent, it makes more sense to do a friendly test and keep
the tested people in a positive frame of mind afterwards.
What is the principal behind Voice Stress
We get this question quite a lot as most
people are familiar with Polygraph test due to its exposure on the
television and very few programs feature VSA test as it is a relative
new technology and not as visual at Polygraph.
For this purposes the producers of programs and movies make use of old
analog polygraph machines (needles & ink systems) for their display
Basically the VSA test comprises the measurement of the flexibility of
the vocal cords. As one starts to stress and enter into the
“fight, flight or freeze (FOF)” mode, the body undergoes
several changes to cope with the danger at hand. One of these changes
is the body reduces blood to the extremities and utilizes it in the
major muscle groups located mainly in the upper body. This causes
the muscles in the throat to tighten and the basic frequency of the
In the late 40’s Dr. Olof Lippold from the University College in
London discovered all humans had a base frequency of between 8 to 12
hertz when in a normal state.
As he put it in his report named
PHYSIOLOGICAL TREMOR, “A slight oscillation at
approximately 10 cycles per second accompanies the normal contraction
of voluntary muscles. It appears to be caused by a
“hunting” mechanism in the reflex that controls the
Once we enter into the FOF syndrome, this basic frequency is diminished
and is significantly less.
A more intimidating test method that has its time and place. Lots of
people refer to Truth Verification tests as Polygraph.
We get asked every day which of the tests is more
The answer is both at the same time, this method is called "PolyStress"
The accuracy of these methods is determined by the integrity, quality
of the training and experience of the examiner.
What is the principal behind Polygraph testing? Click HERE (Wikipedia)