A polygraph test can feel intimidating if you’ve never taken one before. Whether you’re being tested yourself or you’re the person requesting it, understanding the process removes uncertainty and helps ensure the most accurate results
In this article, we’ll walk you through exactly what to expect before, during, and after a polygraph test in South Africa so you feel informed, confident, and prepared.
🧭 Before the Test: Setting the Stage
1. Booking & Initial Contact
Once you contact a professional examiner, they’ll want to understand:
- The issue or case type (theft, relationship, screening, etc.)
- Who is being tested
- Where and when the test will take place
A reputable examiner will ask questions to determine if a polygraph is appropriate for your situation. They’ll also explain the process and answer any initial concerns.
2. Suitability Screening
Not everyone is a suitable candidate for testing. You may not qualify if the subject:
- Is under 18 (without legal consent)
- Is currently pregnant
Ethical examiners will screen red flags before moving forward.
3. Pre-Test Preparation (for the subject)
Leading up to the test:
- Get a good night’s sleep
- Eat a normal meal — don’t arrive hungry or overly full
- Be honest in your pre-test interview
🧪 During the Test: The Full Procedure
1. Pre-Test Interview (30–60 minutes)
This is where the real work begins. The examiner will:
- Explain the test procedure and equipment
- Go through the case background
- Review all test questions in advance
- Assess the subject’s physical and emotional state
- Clarify any misunderstandings
There are no surprise questions; everything is discussed beforehand.
2. Sensor Setup
Sensors are placed to measure physiological activity such as:
- Skin conductivity (electrodermal response)
- Heart rate and blood pressure
- Upper and lower body movement
A modern computerised polygraph system will display and record this data.
3. The Actual Test (30–60 minutes spread over multiple tests that are repeated)
The subject is asked a series of yes/no questions, no open-ended responses. Multiple charts are recorded. This part of the polygraph is quiet and focused.
Does Nervousness Affect Polygraph Results?
Feeling nervous is normal and doesn’t affect the accuracy of a polygraph test. Examiners expect this and focus on how your body reacts to specific questions, not general anxiety. A pre-test interview helps set your baseline, so natural nervousness won’t cause false results.
Need to schedule a polygraph test or ask about the process?
👉 Contact us now for personalised support.