The Voice Stress Polygraph system records the human voice using a microphone, and the technology is based on the tenet that the non-verbal, low-frequency content of the voice conveys information about the physiological and psychological state of the speaker. This method uses technology that analyses vocal patterns and highlights areas where the speaker is stressed. However, unlike a polygraph, this is not done through any physical attachments.

We make use of AVSAPRO technology. AVSAPRO utilises the Lippold microtremor of voice to deliver accurate and reliable results.