In our modern age where technology and psychology intersect, one tool stands out as a distinctive blend of both disciplines—the lie detector. Also known as a polygraph, this instrument has transformed the way we approach truth verification. But the crux of its efficacy lies in the interpretation of its results.
At its core, a lie detector works by measuring physiological responses such as blood pressure, pulse, and skin conductivity as the examinee responds to questions. These reactions are assumed to spike when the examinee provides a deceptive answer. However, identifying these deceptive responses isn’t straightforward. There are no exclusive physiological reactions associated with lying, thus separating liars from truth tellers can be challenging.
To navigate these complexities, polygraph examiners adopt validated scoring techniques. Over recent years, a shift towards computerised scoring has been observed in the industry. Computerised scoring, known for its precision, supplements the traditional manual method, providing an additional layer of scrutiny.
At Lie Detector UK, we utilise the Empirical Scoring System (ESS) while interpreting polygraph results. ESS is a manual test data analysis (TDA) model that assigns numerical values to psychophysiological detection of deception (PDD) test data. It is used for examinations conducted using comparison question test (CQT) formats. Our use of ESS is rooted in its solid research foundation, with its principles, assumptions, and procedures all backed by substantial evidence.
To enhance accuracy further, we use ESS scoring in conjunction with the ESS Algorithm built into the Stoelting software. This software double-checks our manually scored results, thus reducing the risk of human error. If any discrepancies emerge at this stage, we refer the data for a full quality control process involving another examiner.
The ESS is designed to provide the field examiner with a simplified, yet validated and reliable scoring model. Its simplicity means that even inexperienced scorers can quickly acquire and retain scoring skills. Moreover, its straightforwardness enables clear explanation to non-polygraph professionals, promoting transparency in our processes.
In conclusion, lie detector results represent a fusion of technology and human interpretation, both working in harmony to discern truth from deception. At Lie Detector UK, our commitment to the ESS scoring system and its accompanying software ensures a consistent, reliable, and precise interpretation of polygraph test results, empowering our clients with clarity and confidence in their pursuit of truth.