Most people who look into polygraph testing arrive with a question the method cannot answer. They want to know whether a partner still loves them, whether a business contact is trustworthy in general, or whether an employee is a decent person. A polygraph examination does none of that. It checks specific, dated, verifiable statements about things that have already happened, and it does so with a measurable degree of accuracy. Understanding that distinction before booking saves money, time and a good deal of disappointment.
What the instrument actually records
A modern examination tracks several independent physiological channels at the same time: breathing pattern, electrodermal activity, cardiovascular response and small involuntary movements. None of these channels means deception on its own. What matters is the comparison between how one person responds to different categories of question within the same session.
That comparison is the whole method. The examiner is not looking for a nervous person, because almost everybody is nervous. They are looking for responses that attach themselves to one specific wording and reappear every time that wording is presented, while neighbouring questions stay quiet. General anxiety lifts the whole chart evenly and does not produce that pattern.
Questions that work and questions that do not
| Can be tested | Cannot be tested |
| Whether money was handed over on a specific date | Whether someone intends to repay in future |
| Whether a person was in a named place at a named time | Whether a person is honest by nature |
| Whether information was passed outside a company | Whether an employee is loyal |
| Whether contact continued after an agreed date | Whether a relationship can be saved |
| Whether a specific item was taken from a specific place | Whether somebody has ever stolen anything |
Every workable question shares three features: one action, one time frame, and a yes or no answer. A request such as “find out if he is lying to me” is not a test topic. It becomes one only after it has been broken down into statements of that kind, and that process alone often resolves part of the dispute, because people discover their complaint was about attention rather than facts.
Consent is a technical requirement, not a formality
An examination cannot be carried out on somebody who has not agreed to it in writing. This is partly an ethical rule, but it is also a practical one. A person who has been pressured into the chair produces a recording that cannot be scored, because resistance to the process contaminates every channel. For the same reason, a refusal is not evidence of anything. It is frequently a reaction to being suspected at all.
In an employment context the point matters even more. Voluntary screening, agreed in advance and limited to work related topics, is a workable tool. A test imposed as a condition of keeping a job is both unreliable and a dispute waiting to happen.
How a session is actually run
- Paperwork and topic agreement. Consent, the subject of the examination, and the list of topics that will be excluded
- Pre-test interview, roughly 30 to 40 minutes. Every question is read out and discussed until both sides read it the same way
- Practice sequence. A short demonstration so the person sees how their own breathing registers
- Recording, roughly 40 to 60 minutes. The question block is presented at least three times with the order changed
- Scoring and result. Charts are evaluated, and the outcome is explained the same day
There are no surprise questions at any point. If an examiner refuses to show the list in advance, that is a reason to look elsewhere: in a correct procedure there is nothing to conceal.
What it costs across Ireland
Pricing follows the format rather than the subject. A standard examination covering one person and one topic is listed at €425, an online format session at €175, and testing conducted in a language other than the examiner’s working language adds €80. Multi topic and corporate examinations are quoted individually, and a first examination booked through the site carries a 15% discount. Current formats, coverage across Dublin, Cork, Limerick, Galway, Waterford and smaller towns, and the full service list are published by the Polygraph Examiners Union on its lie detector Ireland page.
Accuracy figures quoted by practitioners sit in the 95 to 98% range for properly conducted examinations on a single, clearly defined topic. That range is worth reading carefully: it describes a well prepared test, not a rushed thirty minute session with generic questions downloaded from the internet.
Where a result carries weight
- Private disputes and negotiations. The strongest use case. A documented result removes the question of credibility from the conversation and returns it to facts
- Family matters. Often the person under suspicion is the one who books the test, because words have stopped working
- Internal company matters. Grounds for a closer look at access rights, stock control or records, rather than grounds for dismissal on their own
- Court proceedings. A supporting argument at best. No court is obliged to accept a polygraph report, and it is weighed alongside everything else in the file
Five situations where booking is a waste of money
- The decision has already been made and confirmation is what is wanted
- The topic cannot be narrowed to actions and dates
- The events are old or trivial enough that the person may genuinely not remember
- The other party has been pressured into attending
- No action will follow whichever way the result goes
Can a test be arranged for somebody who is not present in the country
Preparation can be handled remotely: the consultation, topic agreement and wording of questions all work by video. The instrumental part cannot, because sensors have to be attached and the room has to be controlled. Anything advertised as a fully remote instrumental test deserves close scrutiny.
What happens if the person is unwell on the day
The session is postponed. Serious cardiovascular conditions, late pregnancy, acute pain, intoxication and severe sleep deprivation all make a recording impossible to score. An examiner who agrees to test anybody in any condition is selling certainty rather than information.
Who receives the result
Only the client named in the agreement and the person examined. Topics outside the agreed subject are not included in the test at all, which is why the question list is fixed before the recording starts.
