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Whether you’re trying to resolve a workplace dispute, address infidelity in a relationship, or navigate a custody or criminal investigation, polygraph testing (commonly known as a lie detector test) might come up as a possible solution.
But before you schedule a test, you’re likely wondering:
“How much does a lie detector test cost?”
And more importantly: Is it accurate? Is it legal? Is it worth it?
This guide covers everything you need to know, from pricing and factors that influence cost to what actually happens during a test and what the results can (and can’t) be used for.
The average cost of a professional lie detector test in the U.S. is between:
Service Type | Price Range (USD) |
Standard Polygraph Exam | $300 – $600 |
Infidelity or Relationship Test | $400 – $700 |
Legal or Court-Admissible Test | $600 – $1,200+ |
Multiple-issue or Extended Test | $800 – $1,500+ |
Important: Prices may vary based on location, examiner experience, number of questions, and the type of case.
Be cautious of providers offering tests under $250. It may signal poor quality or lack of certification.
Several variables can impact what you’ll pay for a lie detector test:
Some examiners offer mobile services (coming to your home or office), which can increase cost by $100–$300.
A high-quality polygraph exam typically includes:
(Optional) Expert testimony if results are used in legal proceedings
In most states, polygraph results are not automatically admissible as evidence in criminal court. However:
You might consider scheduling a test if:
Remember: No test is perfect, but a well-conducted polygraph can help build trust, clarify doubt, or support your legal strategy.
A lie detector test isn’t magic, but it can be a powerful tool when used in the right situation, with the right expectations.
If you’re dealing with accusations, trust issues, or legal tension, a polygraph test may help bring clarity and closure. But make sure you choose a qualified, certified examiner and understand the legal limits of how the results can be used.
In short:
When used appropriately, a lie detector test can offer answers, clear up misunderstandings, and provide valuable peace of mind.
Polygraph tests are generally accurate but not foolproof. Accuracy rates are often cited between 80% to 90%, depending on the examiner’s skill, equipment, and the subject’s state of mind.
Only in some cases. Many U.S. courts do not accept lie detector results as standalone evidence, but they may be considered if both parties agree, or in civil cases and internal investigations.
You can choose your own examiner for personal or private matters. For legal cases, especially when admissibility is involved, your attorney may recommend a certified examiner with courtroom experience.
It’s rare, but possible. Skilled liars, those with certain psychological conditions, or individuals trained to control physiological responses, may falsely pass. This is why test results are rarely used as definitive proof in court.
Expect about 1.5 to 2 hours total. This includes a pre-test interview, the actual polygraph session (30–45 minutes), and post-test review.
We provide access to licensed, certified polygraph examiners who specialize in:
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