Missouri Polygraph Examiner Licensing
Exam Practice Questions And Correct
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Rationales 2026 Q&A | Instant
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1. What is the primary purpose of a polygraph examination?
A. To detect lies with 100% accuracy
B. To measure physiological responses associated with deception
C. To replace interrogation techniques
D. To determine guilt beyond reasonable doubt
Answer: B
Rationale: The polygraph measures physiological reactions such as
respiration, blood pressure, and skin conductivity that may indicate
deception but does not directly detect lies.
2. The component of a polygraph that records skin conductivity is called:
A. Pneumograph
B. Cardiograph
, C. Galvanograph
D. Oscilloscope
Answer: C
Rationale: The galvanograph measures electrodermal activity (skin
conductivity), which is sensitive to emotional arousal.
3. Which phase of a polygraph exam involves explaining questions to the
examinee?
A. Chart collection phase
B. Pre-test phase
C. Post-test phase
D. Scoring phase
Answer: B
Rationale: The pre-test phase includes explanation of procedures and
question review to ensure understanding and reduce anxiety.
4. The most commonly used polygraph question technique in the U.S. is:
A. Peak of tension test
B. Relevant/irrelevant test
C. Comparison question test (CQT)
D. Guilty knowledge test
Answer: C
Rationale: The CQT is widely used because it compares responses to
relevant and control questions.
,5. In polygraph testing, “control questions” are designed to:
A. Directly accuse the examinee
B. Be emotionally stimulating but not directly related to the issue
C. Replace relevant questions
D. Prove guilt conclusively
Answer: B
Rationale: Control questions are broad and likely to provoke concern
in both truthful and deceptive individuals.
6. Which physiological system is NOT typically measured in a polygraph?
A. Cardiovascular system
B. Respiratory system
C. Central nervous system
D. Electrodermal activity
Answer: C
Rationale: Polygraphs measure peripheral physiological responses,
not direct brain activity.
7. A pneumograph measures:
A. Blood pressure
B. Respiration
C. Skin temperature
D. Eye movement
Answer: B
, Rationale: Pneumographs record breathing patterns using chest and
abdominal movement sensors.
8. The guilty knowledge test (GKT) is based on:
A. Emotional arousal to control questions
B. Recognition of crime-related details
C. Random guessing
D. Interview stress
Answer: B
Rationale: GKT measures recognition of specific details only a guilty
person would know.
9. A key ethical requirement for polygraph examiners is:
A. Guaranteeing results
B. Avoiding informed consent
C. Maintaining confidentiality
D. Sharing results with media
Answer: C
Rationale: Examiners must protect examinee confidentiality and
handle data ethically.
10. Which is a common countermeasure against polygraph testing?
A. Deep breathing exercises during answers
B. Increasing hydration
C. Physical counter-stimulation or mental distractions
D. Eating before the exam
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of a polygraph examination?
A. To detect lies with 100% accuracy
B. To measure physiological responses associated with deception
C. To replace interrogation techniques
D. To determine guilt beyond reasonable doubt
Answer: B
Rationale: The polygraph measures physiological reactions such as
respiration, blood pressure, and skin conductivity that may indicate
deception but does not directly detect lies.
2. The component of a polygraph that records skin conductivity is called:
A. Pneumograph
B. Cardiograph
, C. Galvanograph
D. Oscilloscope
Answer: C
Rationale: The galvanograph measures electrodermal activity (skin
conductivity), which is sensitive to emotional arousal.
3. Which phase of a polygraph exam involves explaining questions to the
examinee?
A. Chart collection phase
B. Pre-test phase
C. Post-test phase
D. Scoring phase
Answer: B
Rationale: The pre-test phase includes explanation of procedures and
question review to ensure understanding and reduce anxiety.
4. The most commonly used polygraph question technique in the U.S. is:
A. Peak of tension test
B. Relevant/irrelevant test
C. Comparison question test (CQT)
D. Guilty knowledge test
Answer: C
Rationale: The CQT is widely used because it compares responses to
relevant and control questions.
,5. In polygraph testing, “control questions” are designed to:
A. Directly accuse the examinee
B. Be emotionally stimulating but not directly related to the issue
C. Replace relevant questions
D. Prove guilt conclusively
Answer: B
Rationale: Control questions are broad and likely to provoke concern
in both truthful and deceptive individuals.
6. Which physiological system is NOT typically measured in a polygraph?
A. Cardiovascular system
B. Respiratory system
C. Central nervous system
D. Electrodermal activity
Answer: C
Rationale: Polygraphs measure peripheral physiological responses,
not direct brain activity.
7. A pneumograph measures:
A. Blood pressure
B. Respiration
C. Skin temperature
D. Eye movement
Answer: B
, Rationale: Pneumographs record breathing patterns using chest and
abdominal movement sensors.
8. The guilty knowledge test (GKT) is based on:
A. Emotional arousal to control questions
B. Recognition of crime-related details
C. Random guessing
D. Interview stress
Answer: B
Rationale: GKT measures recognition of specific details only a guilty
person would know.
9. A key ethical requirement for polygraph examiners is:
A. Guaranteeing results
B. Avoiding informed consent
C. Maintaining confidentiality
D. Sharing results with media
Answer: C
Rationale: Examiners must protect examinee confidentiality and
handle data ethically.
10. Which is a common countermeasure against polygraph testing?
A. Deep breathing exercises during answers
B. Increasing hydration
C. Physical counter-stimulation or mental distractions
D. Eating before the exam
