Infidelity Lie Detector Test Questions: A UK Guide to Clear, Action-Based Polygraphing
Overview
Polygraph examinations are sometimes used in relationship disputes to clarify allegations of infidelity. The most reliable approach is to ask specific, incident-focused questions about actions—not thoughts or emotions—because polygraphs measure physiological responses, not feelings or beliefs.
Why Question Design Matters
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Measure what the tool measures: Polygraphs assess physiological changes; they do not read minds or emotions.
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Action over emotion: Focus on concrete behaviour (e.g., sexual contact) rather than subjective states (“Did you love them?”).
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Avoid intrusive/irrelevant topics: Questions on race, religion, sexual orientation, politics, or general beliefs are inappropriate and can undermine validity.
Common Infidelity Polygraph Questions (Action-Focused)
Use precise, time-bounded wording tailored to the case:
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“Since the start of your relationship with [partner’s name], have you had sexual intercourse with anyone else?”
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“Since the start of the relationship, have you had sexual contact with anyone other than [partner’s name]?”
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“During the relationship period, have you arranged to meet someone you are attracted to, in person or via any form of communication?”
Tips
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Define the time window (e.g., “since 1 January 2024”).
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Define terms (e.g., what counts as “sexual contact”) in the pre-test briefing.
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Keep questions short, clear, and unequivocal.
The Single-Issue Polygraph Technique
A focused protocol used when one allegation dominates (e.g., infidelity).
Benefits
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Higher clarity: Narrow scope reduces noise from unrelated matters.
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Efficiency: Fewer, targeted questions speed analysis.
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De-escalation: Objective, tightly framed findings can reduce conflict.
Example core item
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“Since entering the relationship with [partner’s name], have you had sexual intercourse with anyone else?”
Accuracy, Limits, and Ethics
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Professionally conducted polygraphs can reach high accuracy, but they are not infallible and should be weighed alongside other information.
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In England, Wales, and Northern Ireland, polygraph results are generally not admissible in criminal courts; they may be used operationally (e.g., offender monitoring) or privately with informed consent.
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Ethical practice requires voluntary participation, confidentiality, impartiality, and clear documentation.
Preparing for an Infidelity Polygraph
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Read the process summary: Familiarity reduces unnecessary anxiety.
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Sleep normally: Arrive well-rested and hydrated.
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Stick to routine: Avoid unusual stimulants, sedatives, or drastic diet changes unless medically prescribed (disclose medications in the pre-test).
Poorly Framed Questions (Avoid)
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Emotion-based: “Did you feel guilty?”
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Vague time frames: “Have you ever…?” (without dates)
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Ambiguous terms: “Intimacy” (unless operationally defined)
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Intrusive/irrelevant personal beliefs: religion, politics, orientation, etc.
Documentation and Reporting
A professional report typically includes:
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Case scope & time frame
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Question set & definitions
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Instrumentation & procedure
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Chart analysis & outcome statement
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Limitations and contextual notes