Suspicion has crossed a Canadian relationship and you want answers — this guide explains how to book a lie detector test for infidelity, with LieDetectorTest.com arranging a professional examiner.
Everything you need to know about booking a private polygraph test for infidelity in Canada, including how to find a qualified examiner, provincial privacy considerations, what questions can be asked, costs, and exactly what to expect on test day.
TL;DR — The Short Version
- Private and voluntary — Infidelity polygraph tests in Canada are completely confidential and require voluntary consent from the person being tested.
- Cost range — Expect to pay between $500 and $1,000 CAD depending on location, examiner qualifications, and session complexity.
- Booking lead time — Most examiners can schedule within one to two weeks, with some offering expedited appointments.
- Session length — A typical infidelity polygraph takes 90 minutes to 2.5 hours, including the critical pre-test interview.
- Question format — Only specific, yes-or-no relevant questions are used. All questions are reviewed with the examinee beforehand — no surprise questions.
- Not court evidence — The Supreme Court of Canada ruled in R. v. Béland (1987) that polygraph results are generally inadmissible in criminal proceedings, but private testing serves as a powerful tool for personal relationship resolution.
- Provincial laws vary — Privacy legislation differs between provinces, but private polygraph testing is legal across Canada when both parties consent.
- Examiner credentials matter — Always verify your examiner graduated from an APA-accredited school (minimum 400 hours of training) and maintains professional membership.
Who This Guide Is For
- Canadians who suspect a partner of infidelity and want a structured path to truth
- Partners who have been accused of infidelity and want to prove their innocence
- Couples working through trust issues who want a definitive resolution tool
- Therapists and counselors looking for polygraph referral information for clients
- Anyone considering booking a private lie detector test in Canada and needs practical guidance
- People researching the process, costs, and legal aspects before making a decision
Why Canadians Choose Infidelity Polygraph Testing
The Weight of Suspicion in Relationships
Infidelity is one of the most emotionally devastating experiences in a relationship. According to polling data, approximately 10% of Canadians admit to having cheated on their significant other, with 13% of men and 8% of women acknowledging infidelity Verified FAQ — Canadian Association of Police Polygraphists (CAPP)
Confirms polygraph examination is voluntary, all questions are reviewed beforehand with no surprise questions, and possible outcomes include Truthful, Deceptive, or Inconclusive. Any qualified Canadian examiner will verify consent before proceeding and will refuse to test anyone who appears to be under duress.
Polygraph use in Canada has a well-established institutional history. The RCMP has been using the polygraph since the early 1970s Verified FAQ — Canadian Association of Police Polygraphists (CAPP)
Confirms polygraph examination is voluntary, all questions are reviewed beforehand with no surprise questions, and possible outcomes include Truthful, Deceptive, or Inconclusive.
There are three types of questions used in a standard polygraph examination:
Relevant questions — These directly address the specific allegation or concern. For an infidelity test, a relevant question might be: "Since your marriage to [name], did you have sexual contact with anyone other than your spouse?"
Comparison questions — These are broader questions about past behaviour designed to provide a physiological baseline for comparison with the relevant questions.
Irrelevant questions — Simple, non-threatening questions like "Is today Tuesday?" or "Are you sitting in a chair?" that establish a baseline for normal physiological activity.
For more on developing effective questions, our guide on questions to ask a cheater can help you prepare the right concerns to share with your examiner.
Examples of Appropriate Infidelity Polygraph Questions
The following examples illustrate the type of specific, targeted questions that a qualified examiner might develop for an infidelity polygraph. All questions must be answerable with a simple yes or no:
"Since January 2024, have you had sexual intercourse with anyone other than [partner name]?"
"Have you engaged in any romantic or sexual relationship with [specific person] since your marriage?"
"Since moving to [city], have you exchanged sexual messages or images with anyone other than your partner?"
"Have you visited any dating websites or apps with the intent to meet someone for a sexual encounter since [date]?"
"Did you have physical sexual contact with anyone during your business trip to [location] in [month/year]?"
For broader context on how technology is shaping infidelity, see our analysis of online infidelity technology trends and predictions.
What Questions Cannot Be Asked
A qualified examiner will refuse to include questions that are:
Vague or overly broad — "Have you ever been unfaithful?" is too broad. The question must specify a time frame and define what constitutes the behaviour in question.
Compound — Questions that combine multiple issues ("Did you cheat on me or lie about where you were?") produce unreliable results because the examiner cannot determine which part triggered a physiological response.
Designed to humiliate — Questions intended to embarrass or degrade rather than establish truth are ethically prohibited.
Outside the agreed scope — If the test is about alleged infidelity with a specific person, questions about unrelated financial behaviour or substance use are inappropriate.
Leading or suggestive — Questions must be neutral and factual, not designed to produce a particular response. Understanding things that contaminate polygraph results helps ensure the test is conducted under optimal conditions.
Infidelity Polygraph Costs Across Canadian Provinces
What to Expect to Pay
Infidelity polygraph costs in Canada typically range from $500 to $1,000 CAD. The exact price depends on several factors including geographic location, examiner qualifications and experience, complexity of the issues to be tested, and whether travel is required (particularly for remote or northern locations). Examiners in major metropolitan areas like Toronto, Vancouver, and Montreal tend to have competitive pricing due to a larger pool of qualified practitioners. In Atlantic Canada and northern regions, costs may be higher due to the need for examiners to travel.
Most examiners require payment in full before or at the time of the appointment. Common payment methods include credit card, Interac e-transfer, cash, or certified cheque. A deposit may be required at the time of booking to secure the appointment, with the balance due on test day. Cancellation policies vary, but most examiners require 48–72 hours notice for rescheduling without penalty.
What to Expect on Test Day
The Pre-Test Interview
The pre-test interview typically takes 45–90 minutes and is the most important phase of the entire examination. As the Canadian Association of Police Polygraphists outlines, during the pre-test interview the polygraph examiner will explain your legal rights and the voluntary nature of the examination, discuss your medical, physical, and psychological background, review your knowledge of the issues under investigation, and explain how the instrument works Verified FAQ — Canadian Association of Police Polygraphists (CAPP)
Confirms polygraph examination is voluntary, all questions are reviewed beforehand with no surprise questions, and possible outcomes include Truthful, Deceptive, or Inconclusive.
The examiner uses this time to build rapport, assess your suitability for testing, develop and refine the test questions, and ensure you fully understand every question that will be asked. Every question that appears on the test is reviewed during this interview — there are no surprise questions Verified FAQ — Canadian Association of Police Polygraphists (CAPP)
Confirms polygraph examination is voluntary, all questions are reviewed beforehand with no surprise questions, and possible outcomes include Truthful, Deceptive, or Inconclusive. For honest individuals approaching the test, our guide on 10 ways honest people can pass a polygraph test provides reassurance and practical tips.
The In-Test Phase
During the in-test phase, you will be connected to the polygraph instrument, which monitors several physiological channels simultaneously: respiratory patterns (via pneumograph tubes around the chest and abdomen), electrodermal activity (via fingertip sensors measuring sweat gland activity), cardiovascular activity (via a blood pressure cuff), and in many modern systems, movement sensors.
The examiner will conduct multiple chart series, typically three to five, each lasting approximately five minutes. Between charts, you may be given brief breaks. The entire in-test phase usually lasts 30–60 minutes. Learn more about what factors can affect results in our article on whether caffeine can affect polygraph test results.
The Post-Test Interview
Following data collection, the examiner analyses the charts using validated scoring algorithms. During the post-test interview, the polygraph examiner will discuss the results and provide their professional opinion Verified FAQ — Canadian Association of Police Polygraphists (CAPP)
Confirms polygraph examination is voluntary, all questions are reviewed beforehand with no surprise questions, and possible outcomes include Truthful, Deceptive, or Inconclusive. Possible outcomes include Truthful (No Deception Indicated), Deceptive (Deception Indicated), or Inconclusive Verified FAQ — Canadian Association of Police Polygraphists (CAPP)
Confirms polygraph examination is voluntary, all questions are reviewed beforehand with no surprise questions, and possible outcomes include Truthful, Deceptive, or Inconclusive.
The APA's meta-analysis of validated techniques found that single-issue tests produce an inconclusive rate of approximately 11%, while multi-issue tests show about a 13% inconclusive rate Verified FAQ — Canadian Association of Police Polygraphists (CAPP)
Confirms polygraph examination is voluntary, all questions are reviewed beforehand with no surprise questions, and possible outcomes include Truthful, Deceptive, or Inconclusive. Any qualified examiner will verify voluntary consent before proceeding and will refuse to test anyone under duress.
Who can see my polygraph results?
Under Canadian privacy law, including PIPEDA and applicable provincial legislation, the examiner cannot disclose your results to anyone without your explicit written consent [7]Verified PIPEDA fair information principles — Office of the Privacy Commissioner of Canada
Confirms PIPEDA's 10 fair information principles including accountability, consent, limiting collection, security safeguards, and individual access rights. You control who sees your results. Before the test, you can sign a release form specifying who is authorized to receive the results — typically your partner or a therapist. If you do not sign a release, the results remain confidential between you and the examiner.
What qualifications should I look for in a Canadian polygraph examiner?
The most important credential is graduation from an APA-accredited polygraph training program, which requires a minimum of 400 hours of in-residence study [14]Verified APA-Accredited Polygraph Training — Minimum 400 Hours
Confirms APA-accredited programs require a minimum of 400 hours of in-residence study completed over 10 to 17 weeks. Also look for active membership in the APA or CAPP, specific experience with infidelity/relationship testing, continuing education compliance (30 hours every two years for APA members [16]Verified Policy for APA Continuing Education Hours — American Polygraph Association
Confirms practicing examiners must complete a minimum of 30 continuing education hours every two years), professional liability insurance, and use of modern computerized polygraph equipment.
Can medications or medical conditions affect polygraph results?
Certain medications and medical conditions can affect physiological responses measured during a polygraph. This is why every qualified examiner conducts a thorough medical disclosure during the pre-test phase. Conditions such as severe cardiovascular disease, certain neurological disorders, or heavy use of anti-anxiety medications may need to be discussed. A professional examiner will determine whether testing is appropriate and may recommend rescheduling if conditions are not suitable.
Sources & References
Confirms 10% of Canadians admit to cheating, with 13% of men and 8% of women acknowledging infidelity, and 22% having seriously considered it
Confirms the RCMP has been using polygraph since the early 1970s, per RCMP Truth Verification Section Sgt. Brian Richardson
Confirms RCMP conducted over 4,000 polygraph tests in 2018 including 3,654 pre-employment exams and 548 forensic polygraphs
Confirms the Canadian Police College is APA-accredited and recognized by CAPP, and trains law enforcement, military, and intelligence personnel as professional polygraph examiners
Confirms PIPEDA applies to private-sector organizations across Canada and that Alberta, British Columbia and Quebec have substantially similar provincial privacy laws
Confirms PIPEDA's 10 fair information principles including accountability, consent, limiting collection, security safeguards, and individual access rights
Confirms Quebec Law 25 was passed in late 2021 to modernize Quebec's privacy framework with stricter consent and data-handling requirements
Confirms in a five-to-two decision the Supreme Court held polygraph evidence inadmissible in criminal proceedings, violating rules against oath-helping and prior consistent statements
Confirms polygraph results can be admissible in civil and labour courts in Canada, with courts adopting a variety of views
Brain fingerprinting may escape Canada's polygraph ban because it detects memory recognition rather than lying, creating a potential loophole in Canadian evidence law
Comprehensive edited volume covering all aspects of modern polygraph science and practice including techniques, computerized scoring, and legal issues
Official U.S. Department of Defense policy manual establishing standardized testing procedures, scoring methods, and quality assurance requirements for federal polygraph programs
Confirms APA-accredited programs require a minimum of 400 hours of in-residence study completed over 10 to 17 weeks
Confirms APA has 2,700+ members and requires hundreds of hours of coursework at an APA-approved school plus an internship
Confirms practicing examiners must complete a minimum of 30 continuing education hours every two years
Confirms single-issue tests achieved 89% accuracy (CI 83%–95%) with 11% inconclusive rate; multi-issue tests achieved 85% accuracy (CI 77%–93%) with 13% inconclusive rate
Confirms Limestone Technologies is a real polygraph equipment manufacturer, now a subsidiary of Lafayette Instrument Company, originally based in Kingston, Ontario, Canada
Confirms RCMP brings southern experts to conduct polygraphs in northern regions as needed
Found accuracy index midrange between 0.81 and 0.91 for scientifically acceptable studies, while noting this likely overstates true field accuracy
The NRC concluded that specific-incident polygraph tests perform above chance but well below perfection
Highlighted the Handbook as a significant scholarly contribution with balanced coverage of theory and practice across diverse polygraph techniques
Documented field accuracy estimates of approximately 98% and laboratory accuracy of 83% based on literature reviews
Comprehensive edited volume covering CIT theoretical foundations, laboratory research, field applications, countermeasures, and legal issues
Concluded that fMRI deception detection remained insufficiently validated for individual-level forensic application as of 2012