Truth Verification Test
Voice Stress Analysis (VSA), originally known as Psychological Stress Evaluation (PSE), is a procedure used for the detection of deception (lie detection) or truth verification or to determine psychological stress profiles.
The technology has been used for over 30 years.
BAKER-DVSA software has dramatically improved on outdated technology.
Over 15,000 various VSA systems are in use worldwide.
More than 1500 U.S. law enforcement agencies use VSA.
The U.S. Department of Defence uses VSA in its fight against worldwide terrorism.
THERE ARE NO ATTACHED SENSORS, BLOOD PRESSURE CUFFS, and OR ELECTRODES as in polygraph examinations.
Verbal responses are processed through a computer utilising proprietary BAKER - DVSA software.
The software detects, measures and displays certain stress-related components of the voice.
Superimposed on the audible voice frequencies are inaudible frequency modulations (FM) whose strength and pattern relate inversely to the degree of psychological stress in the speaker at the moment of utterance.
These involuntary frequency modulations result from minute oscillations of the muscles of the voice mechanism.
Such oscillations, known as physiological tremor or micro-tremor, can be shown in the laboratory as a normal accompaniment to the activity of any voluntary muscle, occurring at a rate of 8-14 cycles per second.
Most of the functional indicators of stress are attributed to the Autonomic Nervous System, physiological tremor as seen in the voice mechanism is controlled by the Central Nervous System; as the ANS gains dominance in a stress situation, the micro-tremors are suppressed, and the FM in the voice utterance is moderated or completely disappears.
We are registered with the IDECO System so we can do police clearance checks to ensure staff is not sought criminally. This is done by checking fingerprints against the SAPS database.