classic | mobile
Follow us on:
Follow us on Facebook  Share via Twitter  Share via LinkedIn
 

Search...
Hi-Tech Security Solutions Business Directory
Residential Estate Security Handbook 2018


Polygraphing versus voice analysis
May 2018, Security Services & Risk Management

We’ve all seen the use of polygraphs in American movies, especially when someone says a polygraph is not admissible in court or when they catch a bad guy after using a ‘lie detector’. There are many polygraph service providers in South Africa and this mechanism has been used in various situations over the years, but is it a good option when doing employee screening.

Jenny Reid
Jenny Reid

Hi-Tech Security Solutions asked Jenny Reid, CEO of iFacts for her take on the polygraph and its utility in screening today, as well as voice stress analysis.

Reid says that current trends indicate that people and organisations are actually moving away from the traditional polygraph test (the one made famous by movies), to the new Voice Stress Analysis (VSA). Opinions differ in terms of which method is better, but the industry is certainly moving in the direction of the VSA.

The VSA measures the flexibility of a subject’s vocal chords, Reid explains. “Typically, when a person is put under stress, they will enter into ‘fight, flight, or freeze’ mode. This in turn causes their throat muscles to tighten, which has an effect on their vocal chords. Subjects are asked a range of questions by a qualified analyst, and the VSA measures the physical changes taking place in the subject’s body. However, unlike a polygraph, this is not done through any physical attachments.”

The VSA is a much friendlier test in terms of how it interacts with the subject. Figures suggest that typically around 80% of people that are tested are actually ‘innocent’, and so it certainly makes sense to give these subjects a much friendlier test.

Chris Nel, the managing director of Welcor Truth Verification Centre, suggests that people should do their own research into both the polygraph and the VSA. In short the benefits of the voice stress analysis include:

• More hygienic;

• More subject friendly; and

• Less intimidating to subjects.

However, in many cases it is a personal decision as to which method is better. Some of the key differences between these two methods, which mostly point towards the benefits of VSA, include:

• The VSA doesn’t make use of any physical attachments;

• Subjects are free to move around as they wish;

• VSA is a much newer technology than the polygraph;

• The only possible countermeasure is for the subject to be silent;

• All results are claimed to be conclusive;

• Alcohol, drugs, age and health will not impact on results;

• An unlimited number of questions can be asked in the test; and

• Result charts are able to show and quantify stress patterns.

Dismissing an employee based on a VSA

Remember that an employee cannot be dismissed purely as a result of a polygraph or VSA test, Reid cautions. The results of these tests can and must only be used as supporting evidence when a case is presented at the CCMA. If you are attempting to dismiss an employee based on that person failing a voice stress test, you must make sure that the following is in place:

• Correct paperwork, including a release form signed by the subject;

• Once the test has been conducted, charts have been analysed (in front of subject), and the subject has shown deception to some or other degree, you should tell the subject they have failed, and then complete the report and forward this to the client; and

• The client needs to hold a disciplinary hearing.

For more information contact iFacts, +27 (0)11 609 5124, sonya@ifacts.co.za, www.ifacts.co.za


Credit(s)
  Share via Twitter   Share via LinkedIn      

Further reading:

  • ASIS Security Technology Concepts day
    April 2019, Technews Publishing, This Week's Editor's Pick, Security Services & Risk Management
    ASIS SA kicked the tyres of a few technologies at its first Security Technology Concepts day in February.
  • Securing a reliable source of backup power
    April 2019, Drensky Technologies, Mustek Security Technologies, Specialised Battery Systems, Security Services & Risk Management
    Dependence on a reliable and stable source of electrical power is a part of everyday life, whether for an individual or a business.
  • The value of having a maintenance contract or SLA
    April 2019, Johnson Controls, Mustek Security Technologies, Security Services & Risk Management
    A maintenance contract or SLA offers a company peace of mind regarding the functioning of their security installation.
  • Biodegradable security seals for SA
    April 2019, TruSeal, This Week's Editor's Pick, Asset Management, EAS, RFID, News, Security Services & Risk Management
    The new TruSeal product extension is produced from a special biodegradable material sourced from Malaysia.
  • CCTV operators’ duties to response personnel at crime scenes
    April 2019, Leaderware, This Week's Editor's Pick, CCTV, Surveillance & Remote Monitoring, Security Services & Risk Management
    Control room operators often have a responsibility to monitor response scenes that go beyond the initial detection and response relationship.
  • Simplified surge protection for PoE cameras
    April 2019, BFR Digital, Security Services & Risk Management
    Traditionally the two most common causes of surge arrestors failing to do their job are sub-standard quality, and incorrect earthing.
  • Better energy savings than BMS
    April 2019, Johnson Controls, Integrated Solutions, Security Services & Risk Management
    Central plant optimisation software provides better energy savings than BMS control alone.
  • Hidden person detection
    April 2019, Flow Systems, Security Services & Risk Management
    The FSC HPD system detects any movement generated by a hidden person or persons in contact with the interior or cargo of a vehicle.
  • Making sure the lights don’t go out
    April 2019, Netshield, Security Services & Risk Management
    Based on the state of our current power grid system, load shedding has become a necessary evil as it reduces the risk of a national blackout that could take the country a week to recover from.
  • Gas to replace Eskom’s vapourware?
    April 2019, Security Services & Risk Management
    With Eskom’s unstable electricity supply and increasing tariffs, a handful of estates in Gauteng offer piped gas as an alternative energy source.
  • Is your data protected when the power fails?
    April 2019, Security Services & Risk Management
    It’s relatively easy to lose data due to a power outage, but it’s just as simple to protect it and ensure losses don’t occur.
  • Load shedding calls for essential genset maintenance
    April 2019, Security Services & Risk Management, Fire & Safety
    It is important that such important equipment is maintained properly and serviced regularly in order to be able to cope with extended electricity outages.

 
 
         
Contact:
Technews Publishing (Pty) Ltd
1st Floor, Stabilitas House
265 Kent Ave, Randburg, 2194
South Africa
Publications by Technews
Dataweek Electronics & Communications Technology
Electronics Buyers’ Guide (EBG)

Hi-Tech Security Solutions
Hi-Tech Security Business Directory (HSBD)

Motion Control in Southern Africa
Motion Control Buyers’ Guide (MCBG)

South African Instrumentation & Control
South African Instrumentation & Control Buyers’ Guide (IBG)
Other
Terms & conditions of use, including privacy policy
PAIA Manual
         
    Mobile | Classic

Copyright © Technews Publishing (Pty) Ltd. All rights reserved.