Not all polygraph tests are created equal. The reliability of results depends heavily on both the testing method used and the equipment behind it. If you’re booking a polygraph test, understanding these elements can help you choose the right examiner and get the most accurate results.
Let’s break down the most commonly used testing techniques and the essential tools used by professional polygraph examiners in South Africa.
🧰 Polygraph Equipment Used in South Africa
1. Computerised Polygraph Systems
Modern systems like Lafayette, Stoelting, and Axciton are standard among certified South African examiners. These systems record physiological responses in digital form for real-time display and later analysis.
- Benefits: Precision, reliability, and automatic chart scoring.
- What to ask: “What brand of polygraph equipment do you use?”
2. Key Sensors and Components
Even with computer systems, the physiological sensors remain similar. Here’s what’s typically measured:
- Electrodermal activity (EDA): Measures sweat gland activity (skin conductivity).
- Cardiovascular activity: Heart rate and blood pressure monitoring.
- Movement sensors: Detect subtle body movements that may indicate countermeasures.
- Video and audio recording systems: Record the entire test for quality assurance and transparency.
🎓 Why Testing Method and Equipment Matter
- Inexperienced or undertrained examiners may not use the correct testing format for your case, leading to unreliable results.
- Outdated or incorrect equipment can fail to detect subtle physiological cues or produce poor-quality charts that are hard to interpret.
- Poorly structured tests can trigger false positives, inconclusive outcomes, or unintentional bias.
Conclusion
A polygraph test is only as good as its method and the machine behind it. Professional examiners will select the right testing technique for your situation and use top-tier equipment to ensure results are accurate, valid, and defensible.
Before you book, ask your examiner:
- “What brand and model is your polygraph system?”
- “Do you record the test session with video/audio?”
Getting clear answers to those questions means you’re in good hands.
👉 Need to speak with an examiner who uses the latest polygraph technology?
Contact us for a confidential consultation.