Howdy, folks — Jerry Thomas here. If you have ever wondered why your polygraph examiner uses one particular test format rather than another — or whether the technique being used actually has science behind it — this post is for you. The short answer is: not all polygraph test formats are created equal, and knowing the difference matters — especially if the results are going to be used in a legal, employment, or supervision context.
Why Different Situations Require Different Test Formats
Polygraph examinations are not one-size-fits-all. The instrument records physiological data the same way regardless of format — but the structure of the test, the type of questions asked, and the way those questions are sequenced and scored all vary depending on what is being investigated and why.
The American Polygraph Association recognizes three broad categories of examination:
Specific Issue (Event-Specific) Tests address a single, concrete incident — a theft, an assault, a specific allegation. The questions are tightly focused on that one event, and the test is designed to produce the clearest possible determination of whether the subject is being truthful about that specific act.
Screening Tests cover a broader range of topics and are used most often in pre-employment screening for law enforcement, national security, and other high-trust positions. Rather than focusing on a single event, they survey a candidate's history across multiple areas of concern.
Post-Conviction Sex Offender Testing (PCSOT) is a specialized application used in treatment and supervision contexts, governed by its own APA-specific standards and requiring examiner training beyond the basic credential.
What Makes a Technique "Validated"?
The term "validated" has a specific meaning in the polygraph profession. A validated technique is one that has been subjected to peer-reviewed scientific research, published in credible journals, and reviewed through the APA's formal meta-analytic survey process. Validation is not a matter of tradition, longevity, or widespread use — it requires demonstrated empirical accuracy meeting established standards.
The APA defines a validated testing method as one proven through scientific study to meet a minimum accuracy threshold of 90% for specific-issue evidentiary testing. The APA's Meta-Analytic Survey of Criterion Accuracy of Validated Polygraph Techniques — updated as new research is published — is the profession's primary mechanism for identifying which techniques meet that standard.[1]
Raymond Nelson and Mark Handler have published extensively on what separates validated from non-validated approaches. Their position — and the APA's — is unambiguous: using a non-validated technique in a legal or employment context is professionally indefensible and potentially harmful to both truthful and deceptive examinees alike.
The APA's Validated Techniques — Accuracy at a Glance
The following formats appear on the APA's current validated technique list, each with published research support. Criterion accuracy (CD) figures are drawn from the APA's meta-analytic survey.[1]
| Technique | Primary Use | Accuracy (CD) |
|---|---|---|
| Utah Zone Comparison Test (ZCT) Developed by Raskin & colleagues at University of Utah, 1970+. Over 30 years of systematic refinement. |
Specific issue & screening | .921 |
| Integrated Zone Comparison Test (IZCT) One of the highest-accuracy validated formats for evidentiary use. |
Evidentiary / specific issue | .994 |
| Matte Quadri-Track ZCT (MQTZCT) Developed by James Allan Matte; includes a fourth track for examinees who fear the testing process. |
Evidentiary / specific issue | .994 |
| Federal Zone Comparison Test Standard in federal law enforcement investigations. |
Specific issue | .860 |
| Federal You-Phase Technique Federal law enforcement format; among the five techniques approved for evidentiary use with ESS scoring. |
Specific issue / evidentiary | .883 |
| Air Force Modified General Question Test (AFMGQT) Extensively studied by Nelson, Handler, Oelrich & Cushman. Validated for both screening and event-specific use. |
Screening & specific issue | .817 |
| Directed Lie Screening Test / Test for Espionage & Sabotage (DLST/TES) Uses directed-lie comparison questions. Common in federal and national security contexts. |
Screening | .844–.858 |
| Backster You-Phase Original zone comparison technique developed by Cleve Backster. |
Specific issue | .862 |
| Concealed Information Test (CIT) Tests whether a subject recognizes information only the perpetrator would know. |
Specific issue | .823 |
The APA specifically identifies five techniques that produce mean accuracy rates over 90% with inconclusive rates below 20%, approved for evidentiary use: the Federal You-Phase with ESS, the IZCT, the MQTZCT, the Utah ZCT, and ZCT variants scored with the ESS.[1]
"Polygraph examination is a scientific discipline, and like every scientific discipline, its tools have been subjected to rigorous evaluation. Not all techniques that get called 'polygraph examinations' have earned the same evidentiary standing."
Why Non-Validated Techniques Are Problematic
For the examinee: A non-validated technique means the physiological data being collected has no established relationship to truthfulness or deception. A truthful person could be wrongly identified as deceptive. A deceptive person could escape detection. Neither outcome serves justice.
For the agency or attorney relying on results: Courts applying Daubert or Frye standards require demonstrated scientific reliability — and a non-validated technique cannot meet that standard. Results obtained with non-validated methods are legally and professionally indefensible.
For the examiner: Using a non-validated technique in a professional context is a violation of APA standards and potentially of state licensing requirements where they apply.
How to Verify Your Examiner Is Using a Validated Format
This is a completely reasonable question to ask any examiner before agreeing to an examination — and a qualified examiner will welcome it. Ask specifically which format they use and whether it appears on the APA's validated technique list. Ask whether they use standardized numerical scoring — seven-position scoring, the Empirical Scoring System (ESS), or OSS-3 — rather than global chart interpretation alone. Ask whether they have documentation of the technique's validation research if you need it for a legal proceeding.
A professional examiner will be able to answer all three questions specifically and confidently. If they cannot, that is important information.
References
- APA Research Division. (2011). Meta-analytic survey of criterion accuracy of validated polygraph techniques. Polygraph, 40(4). Full PDF → | APA Validated Techniques FAQ: FAQ PDF →
- Raskin, D.C., & Honts, C.R. (2002). The comparison question test. In M. Kleiner (Ed.), Handbook of Polygraph Testing (pp. 1–47). Academic Press. Utah approach: over 30 years of systematic refinement beginning 1970.
- Nelson, R., Handler, M., Oelrich, M., & Cushman, B. (2014). APA Research Committee Report: AFMGQT format for event-specific examinations. Full PDF →
- Honts, C.R., Thurber, S., & Handler, M. (2021). A comprehensive meta-analysis of the comparison question polygraph test. Applied Cognitive Psychology, 35(2), 411–427. Open Access PDF →
- Handler, M., Honts, C.R., Krapohl, D.J., Nelson, R., & Griffin, S. (2009). Integration of pre-employment polygraph screening into the police selection process. Journal of Police and Criminal Psychology, 24(2), 69–86. Open Access →
Final Thoughts
Knowing which polygraph formats are validated, why validation matters, and how to ask the right questions before an examination begins — that knowledge protects the examinee, the examiner, and the integrity of the process. When you hire a qualified examiner, make sure they can tell you exactly which validated technique they use and why it is appropriate for your situation.
Y'all take care now, and always make sure the tool matches the job.
Questions about which examination format is appropriate for your specific situation? Call or text — I am glad to explain exactly what I use and why, at no obligation.