Lie Detector Test From an Examiner
A real lie detector test is a polygraph exam. You book it with a trained examiner.
Updated . Edited by: Ilyass Ben Hakim.
Where to buy
- American Polygraph AssociationLink · polygraph.org
- Google: polygraph examiner near meLive search · google.com
- Search Amazon (toy lie detectors)Live search · amazon.com
Private examiners test at their office or travel to you. Many work alone or through national booking networks.
Professional insight
Experienced examiners spend most of the session on the pre-test interview. The charts are only one part.
- Confirm current APA membership, not just APA style training.
- A full session usually lasts two to three hours.
- Single issue tests give clearer results than fishing trips.
- Get the report contents and cancellation terms in writing.
Check the label
0 of 7 checked
Red flags
- Polygraph offered over phone, video or an app.
- Voice stress analysis sold as a polygraph.
- Session promised in under one hour.
- Guaranteed result before the test begins.
- Quote far below what other local examiners charge.
Lie detector results explained
| Result | Meaning |
|---|---|
| NDI | No deception indicated |
| DI | Deception indicated |
| INC | Inconclusive, the data was unclear |
| NO | No opinion given |
Inconclusive does not mean the person lied. Examiners may suggest a retest.
Before you buy
The person being tested must agree freely. Pressured or exhausted subjects can give unreadable charts.
Common questions
- Can I buy a polygraph machine to test someone myself?
- Machines exist, but untrained use gives meaningless readings.
- Who books private tests?
- Couples, families, lawyers and businesses settling a single question.
- Can the person refuse?
- Yes. A private polygraph is always voluntary.