Private Polygraph Testing in Tennessee: Consumer Guide

The Polygraph Examiners Act (TCA Title 62, Chapter 27)

Tennessee has one of the most established polygraph regulatory frameworks in the United States. The state's Polygraph program was established in 1978, making it one of the earliest states to formally regulate the profession [1]Verified Tennessee Private Investigation and Polygraph Commission — Official Home Page
Confirms the Polygraph program was established in 1978 and moved to the Detection Services Licensing Program effective July 1, 2021. Effective July 1, 2021, the program is housed within the Commissioner-run Detection Services Licensing Program under the Tennessee Department of Commerce and Insurance [1]Verified Tennessee Private Investigation and Polygraph Commission — Official Home Page
Confirms the Polygraph program was established in 1978 and moved to the Detection Services Licensing Program effective July 1, 2021.

The Polygraph Examiners Act, codified at Tennessee Code Annotated, Title 62, Chapter 27, governs every aspect of polygraph practice in the state — from licensing qualifications and internship requirements to examinee rights and professional standards [2]Verified Tennessee Code Title 62, Chapter 27 — Polygraph Examiners Act (2024)
Confirms the full statutory framework governing polygraph licensing, qualifications, rights, and penalties in Tennessee. It is unlawful for any person, including city, county, or state employees, to administer polygraph examinations or represent themselves as a polygraph examiner without holding a valid license issued by the Commission [3]Verified Polygraph Examiner License Details — Tennessee TN.gov
Confirms it is unlawful to administer polygraphs without a valid license, including for government employees, and confirms minimum instrumentation requirements. This comprehensive regulatory framework ensures that every polygraph examination conducted in Tennessee meets rigorous professional standards. For a complete overview of all Tennessee polygraph regulations, see our Tennessee polygraph laws guide.

Licensing Qualifications and Requirements

Tennessee sets high standards for polygraph examiner licensure. To qualify, an applicant must graduate from a polygraph school approved by the American Polygraph Association or the Commissioner, and hold either a baccalaureate degree from an accredited college or university, or two years of college plus five years of criminal, counterintelligence, or private investigative work [4]Verified Tennessee Code § 62-27-107 — Qualifications for License (2024)
Confirms internship, education, and experience requirements for polygraph examiner licensure in Tennessee. All applicants must be at least 21 years of age and be a citizen of the United States or a resident alien [5]Verified Get a License — Tennessee Private Investigation and Polygraph Commission
Confirms internship structure, continuing education standards, and intern permit validity periods.

Applicants must satisfactorily complete a six-month internship under a licensed Tennessee polygraph examiner who has held a license for at least two years [4]Verified Tennessee Code § 62-27-107 — Qualifications for License (2024)
Confirms internship, education, and experience requirements for polygraph examiner licensure in Tennessee. Alternatively, applicants with at least five consecutive years of active polygraph examination work in another state may qualify in lieu of the internship, provided they submit a current business license, tax records, and a minimum of two letters of recommendation [4]Verified Tennessee Code § 62-27-107 — Qualifications for License (2024)
Confirms internship, education, and experience requirements for polygraph examiner licensure in Tennessee. All applicants must pass a licensing examination administered by PSI Services, covering anatomy and physiology, instrument calibration, question formulation, EPPA compliance, and chart interpretation [7]Verified PSI Examination Bulletin — Tennessee Private Investigation and Polygraph Commission
Confirms the licensing examination process administered by PSI, covering EPPA, test construction, and chart interpretation.

Fingerprint-based criminal history checks through both the TBI and FBI are mandatory for all applicants [8]Verified Fingerprinting Information — Tennessee PI and Polygraph Commission
Confirms TBI and FBI fingerprint-based criminal history check requirement for polygraph license applicants. Licenses must be renewed every two years, and each examiner must complete at least 24 credit hours of continuing education as a prerequisite for renewal [3]Verified Polygraph Examiner License Details — Tennessee TN.gov
Confirms it is unlawful to administer polygraphs without a valid license, including for government employees, and confirms minimum instrumentation requirements. Tennessee also offers reciprocity for out-of-state licensed examiners, subject to the Commission's determination that qualifications have been substantially met [2]Verified Tennessee Code Title 62, Chapter 27 — Polygraph Examiners Act (2024)
Confirms the full statutory framework governing polygraph licensing, qualifications, rights, and penalties in Tennessee. For those interested in entering the profession, visit our become a polygraph examiner page.

Internship Structure

The internship is a carefully structured training process. An intern studies polygraph techniques under the personal supervision and control of a local licensed polygraph examiner in accordance with a course of study prescribed by the Commission [5]Verified Get a License — Tennessee Private Investigation and Polygraph Commission
Confirms internship structure, continuing education standards, and intern permit validity periods. Initially, the intern may administer polygraph examinations only in the presence of a licensed examiner, becoming eligible to conduct some examinations independently during the remaining months of the internship [5]Verified Get a License — Tennessee Private Investigation and Polygraph Commission
Confirms internship structure, continuing education standards, and intern permit validity periods.

Internship permits are valid for 12 months from the date of issue and may be extended for up to six additional months upon good cause shown to the Commission [6]Verified Tennessee Code § 62-27-111 — Internship (2010)
Confirms internship requirements including 12-month validity period, six-month extension option, and sponsor limitations. No licensed polygraph examiner may sponsor more than two interns at any one time, and each sponsor must submit progress reports on their interns to the Commission every 60 days [6]Verified Tennessee Code § 62-27-111 — Internship (2010)
Confirms internship requirements including 12-month validity period, six-month extension option, and sponsor limitations. This structured mentorship ensures that new examiners develop the practical skills necessary for accurate and ethical testing. Similar rigorous frameworks exist in other states — learn more in our US state polygraph associations guide.

Statutory Protections Under TCA § 62-27-125

Tennessee provides some of the strongest examinee protections in the nation. Under TCA § 62-27-125, every prospective examinee must be informed of their rights before the examination begins [9]Verified Tennessee Code § 62-27-125 — Protection of Rights of Examinee (2023)
Confirms all examinee rights including right to refuse, terminate, record, and receive results within 30 days. These rights include:

The right to voluntarily consent to the examination. The right to refuse to take the polygraph examination entirely. The right to refuse to answer any question during the examination. The right to terminate the examination at any time. The right to make a written request within 30 days to receive written results of the examination, upon payment of a reasonable fee not to exceed $40. The right for the examinee or their attorney to make an audio or video recording of the examination and pretest interview. The right to be informed of the examiner's name and license number before the test begins [9]Verified Tennessee Code § 62-27-125 — Protection of Rights of Examinee (2023)
Confirms all examinee rights including right to refuse, terminate, record, and receive results within 30 days.

These protections are enshrined in statute and cannot be waived. If the polygraph examiner is a law enforcement official or officer of the court, this must be disclosed to the examinee prior to the commencement of the examination, along with a warning that any illegal activity disclosed during the test may be used in court [9]Verified Tennessee Code § 62-27-125 — Protection of Rights of Examinee (2023)
Confirms all examinee rights including right to refuse, terminate, record, and receive results within 30 days.

Professional Standards and Conduct Rules

Tennessee's professional standards regulations add additional layers of consumer protection. Under Tenn. Comp. R. & Regs. 1160-01-.06, a polygraph examiner must ensure that there is an interval of at least 10 seconds between the completion of the examinee's answer to one question and the beginning of the next question [12]Verified Tenn. Comp. R. & Regs. 1160-01-.06 — Professional Standards
Confirms 10-second interval rule, three-question repetition requirement, and examiner conduct standards. The examiner must not render any opinion based on chart analysis until the examinee has been asked the same pertinent and relevant questions at least three separate times [12]Verified Tenn. Comp. R. & Regs. 1160-01-.06 — Professional Standards
Confirms 10-second interval rule, three-question repetition requirement, and examiner conduct standards.

After chart analysis, the examinee must be afforded a reasonable opportunity to explain any deceptive reactions evident on the charts, unless the examinee is represented by legal counsel who requests the results be provided to counsel instead [10]Verified Tennessee Code § 62-27-123 — Violations and Penalties (2024)
Confirms prohibited inquiries during employment polygraphs, including five-year lookback limitation and Class C misdemeanor penalties. An examiner may not conduct a polygraph examination if they believe through observation or other credible evidence that the examinee is physically or psychologically unfit for the examination [12]Verified Tenn. Comp. R. & Regs. 1160-01-.06 — Professional Standards
Confirms 10-second interval rule, three-question repetition requirement, and examiner conduct standards. These stringent standards ensure thorough, reliable results and protect examinees from unfair testing practices.

Employment-Specific Protections

Tennessee law provides specific protections in the employment context. During an employment-related polygraph, it is unlawful for an examiner to inquire into matters including sexual orientation, religious beliefs, political affiliation, lawful union activities, any disability covered by the Americans with Disabilities Act, or actions and activities more than five years preceding the date of the examination — except for felony convictions and violations of the Tennessee Drug Control Act [10]Verified Tennessee Code § 62-27-123 — Violations and Penalties (2024)
Confirms prohibited inquiries during employment polygraphs, including five-year lookback limitation and Class C misdemeanor penalties.

Critically, under TCA § 62-27-128, no employer may take any personnel action based solely upon the results of a polygraph examination [11]Verified Tennessee Code § 62-27-128 — Employer Action Based on Polygraph Exam
Confirms TCA § 62-27-128 prohibition on employer personnel action based solely on polygraph results. This provides an important safeguard ensuring polygraph results are used as one tool among many in employment decisions, never as the sole determining factor.

Personal and Relationship Matters

Private polygraph testing serves a wide range of personal needs in Tennessee. One of the most common uses is resolving questions of fidelity and trust in relationships. When suspicion or accusations have created a breakdown in communication, a polygraph examination can provide objective, measurable information that helps couples move forward — whether that means rebuilding trust or making difficult decisions with clarity. Learn more in our guide on lie detector tests for infidelity in Tennessee.

Polygraph testing is also valuable for resolving family disputes, addressing false accusations, and providing personal peace of mind. Research by Belot and van de Ven (2013) found that the average person is only about 54% accurate at detecting deception in interpersonal settings [14]Verified How Private is Private Information? The Ability to Spot Deception in an Economic Game
Foundational research on human ability to detect deception in economic settings, demonstrating approximately 54% accuracy for unaided human judgment, underscoring why professional polygraph instruments provide a significant advantage over human judgment alone. If someone close to you is insisting on a test, our guide on when your partner wants a lie detector test can help you navigate the situation.

Attorney and Legal Strategy

Many Tennessee defense attorneys recommend polygraph testing for clients as part of defense strategies, particularly when results could influence plea negotiations or prosecutorial decisions [17]Verified Use of Lie Detector Tests in Tennessee — Polygraph Admissibility Overview
Confirms that Tennessee law enforcement uses polygraphs as investigative tools and that polygraph results are not admissible even with both parties' agreement. While polygraph results themselves are not admissible in Tennessee courts, the strategic value of a private polygraph examination for an attorney is immense.

Attorneys use polygraph results to evaluate the credibility of their own clients, guide case strategy, and in some cases, present willingness to take a polygraph to prosecutors as evidence of good faith. The Sixth Circuit Court of Appeals has held that an individual's willingness to submit to a polygraph test may be admissible as probative of credibility, even where test results themselves are not [34]Verified An Insured's Willingness to Take a Polygraph Test — Admissible?
Confirms Sixth Circuit holding in Murphy v. Cincinnati Insurance Co. that willingness to take a polygraph may be admissible as probative of credibility. This distinction makes attorney involvement particularly important when polygraph testing is connected to legal proceedings.

Law Enforcement Pre-Employment Screening

Polygraph testing is a standard part of the hiring process for most Tennessee law enforcement agencies. The Tennessee Bureau of Investigation conducts background checks and polygraphs on candidates conditionally selected for employment [19]Verified TBI Police Officer Hiring & Criminal Investigation Division — Tennessee Bureau of Investigation
Confirms TBI conducts background checks and polygraphs on candidates conditionally selected for employment, and the Criminal Investigation Division conducts polygraph examinations for law enforcement agencies. TBI Special Agents may also be selected for polygraph testing administration as part of their investigative duties [19]Verified TBI Police Officer Hiring & Criminal Investigation Division — Tennessee Bureau of Investigation
Confirms TBI conducts background checks and polygraphs on candidates conditionally selected for employment, and the Criminal Investigation Division conducts polygraph examinations for law enforcement agencies. The TBI's Criminal Investigation Division conducts polygraph examinations regarding allegations of criminal conduct at the request of local, state, and federal law enforcement agencies [19]Verified TBI Police Officer Hiring & Criminal Investigation Division — Tennessee Bureau of Investigation
Confirms TBI conducts background checks and polygraphs on candidates conditionally selected for employment, and the Criminal Investigation Division conducts polygraph examinations for law enforcement agencies.

The Tennessee Highway Patrol also requires polygraph examinations as part of its intense background investigation for state trooper candidates [19]Verified TBI Police Officer Hiring & Criminal Investigation Division — Tennessee Bureau of Investigation
Confirms TBI conducts background checks and polygraphs on candidates conditionally selected for employment, and the Criminal Investigation Division conducts polygraph examinations for law enforcement agencies. Many municipal police departments across the state, including the Clarksville Police Department, require polygraph testing as a condition of employment [18]Verified Clarksville Police Department — Join CPD
Confirms that polygraph testing is a required part of the conditional employment offer for Tennessee police officers. Pre-employment law enforcement screenings are generally covered by the hiring agency. For a deeper look, see our Tennessee law enforcement polygraph guide.

Post-Conviction Sex Offender Testing (PCSOT)

In 1995, the Tennessee General Assembly created the Sex Offender Treatment Board, which is administratively housed at the Tennessee Department of Correction [21]Verified Tennessee Sex Offender Treatment Board
Confirms the Sex Offender Treatment Board was created in 1995 and is housed at the Tennessee Department of Correction. The Board consists of 12 appointed individuals dedicated to reducing the likelihood of recidivism by sexually based offenders [21]Verified Tennessee Sex Offender Treatment Board
Confirms the Sex Offender Treatment Board was created in 1995 and is housed at the Tennessee Department of Correction. Polygraph testing is a key component of the comprehensive treatment and monitoring framework.

Polygraph and other psycho-physiological test devices are utilized in conjunction with therapy to monitor activities, treatment progress and participation, self-disclosure, community risk, and overall program compliance [22]Verified Sex Offender Treatment — U.S. District Court, Eastern District of Tennessee
Confirms polygraph testing is utilized in conjunction with therapy for sex offender monitoring and compliance. The APA's 2021 Model Policy for Post-Conviction Sex Offender Testing identifies four basic types of PCSOT examinations: instant offense exams, sexual history disclosure exams, maintenance exams, and sexual offense monitoring exams [23]Verified APA Model Policy for Post-Conviction Sex Offender Testing (2021)
Confirms the four basic types of PCSOT examinations and program goals for public safety. The Tennessee Department of Correction maintains a list of approved PCSOT polygraph examiners through the Sex Offender Treatment Board [36]Verified TSOTB Polygraph Examiners — Tennessee Department of Correction
Confirms Tennessee maintains a list of approved PCSOT polygraph examiners through the Sex Offender Treatment Board.

The Three-Phase Examination Process

A typical polygraph examination takes between two and three hours and follows a structured three-phase process. Under federal EPPA guidelines, a polygraph test must last a minimum of 90 minutes [27]Verified Employee Polygraph Protection Act — U.S. Department of Labor (29 CFR Part 801)
Confirms EPPA requirements, 90-minute minimum test duration, and five-test daily maximum.

The pre-test interview is the longest phase, typically lasting 60 to 90 minutes. During this phase, the examiner explains the testing process, reviews your rights under Tennessee law, discusses the issue or questions to be addressed, and establishes a baseline understanding of your physiological responses. You will sign the notification form prescribed by the Commissioner acknowledging your rights [9]Verified Tennessee Code § 62-27-125 — Protection of Rights of Examinee (2023)
Confirms all examinee rights including right to refuse, terminate, record, and receive results within 30 days. This is your opportunity to ask questions and understand exactly what will happen.

The instrument-collection phase (the actual test) typically lasts 20 to 40 minutes. The polygraph instrument records cardiovascular patterns, respiratory or breathing patterns, and electro-dermal or galvanic skin response patterns as a minimum — these are the minimum instrumentation requirements established by Tennessee law [3]Verified Polygraph Examiner License Details — Tennessee TN.gov
Confirms it is unlawful to administer polygraphs without a valid license, including for government employees, and confirms minimum instrumentation requirements. Tennessee regulations require that each pertinent question be asked at least three separate times during this phase [12]Verified Tenn. Comp. R. & Regs. 1160-01-.06 — Professional Standards
Confirms 10-second interval rule, three-question repetition requirement, and examiner conduct standards, with a minimum 10-second interval between questions [12]Verified Tenn. Comp. R. & Regs. 1160-01-.06 — Professional Standards
Confirms 10-second interval rule, three-question repetition requirement, and examiner conduct standards.

The post-test review occurs after chart analysis. The examiner will discuss the results and provide the examinee with a reasonable opportunity to explain any deceptive reactions evident on the charts [10]Verified Tennessee Code § 62-27-123 — Violations and Penalties (2024)
Confirms prohibited inquiries during employment polygraphs, including five-year lookback limitation and Class C misdemeanor penalties. Results are typically available within 24 to 48 hours.

Recording Your Examination

Tennessee law explicitly grants the examinee or the examinee's attorney the right to make an audio or video recording of the examination and pretest interview [9]Verified Tennessee Code § 62-27-125 — Protection of Rights of Examinee (2023)
Confirms all examinee rights including right to refuse, terminate, record, and receive results within 30 days. This is one of the strongest recording protections in the country and ensures complete transparency in the testing process. Recording your examination creates a valuable record that can be reviewed by your attorney or used to verify that proper procedures were followed.

Current Pricing Overview

Private polygraph tests in Tennessee typically cost between $500 and $1,200 per person depending on the type of test, examiner experience, and location [13]Verified Average Polygraph and Lie Detector Test Cost
Confirms private polygraph tests typically cost $500–$1,200 with a national average around $800 for single-issue exams. The national average for a single-issue polygraph examination is approximately $800 [13]Verified Average Polygraph and Lie Detector Test Cost
Confirms private polygraph tests typically cost $500–$1,200 with a national average around $800 for single-issue exams. Factors that influence pricing include the complexity of the issue being examined, whether the test is for personal, legal, or employment purposes, and any travel requirements for the examiner.

Pre-employment law enforcement screenings generally cost $400 to $500 and are usually covered by the hiring agency [24]Verified Polygraph Validity Research — American Polygraph Association
Confirms the 2011 meta-analysis findings of 89% accuracy for single-issue, 85% for multi-issue, and 87% combined accuracy for validated techniques across 38 studies and 3,723 examinations. Attorney-requested forensic examinations may cost more due to the additional procedural requirements and detailed reporting involved. For PCSOT examinations, costs may vary and can be subject to state-established fee schedules.

For current pricing information specific to our Tennessee locations, visit our polygraph test prices page. For cost comparisons with nearby states, check our guides on lie detector test costs in Indiana and lie detector test costs in Missouri.

What Your Fee Covers

A professional polygraph examination fee covers the entire multi-stage process: case consultation and review, question formulation tailored to your specific situation, the pre-test interview, instrument setup and calibration, the in-chart testing phase with multiple question presentations, chart analysis using validated techniques, and a post-test discussion of results. Detailed written reports, court testimony, and travel outside normal service areas may incur additional fees.

The American Polygraph Association does not set specific fee schedules, leaving pricing to the examiner's discretion based on their qualifications and the complexity of the case. However, consumers should be cautious of prices that seem unusually low, as this may indicate shortcuts in the testing process that compromise accuracy.

Using the Official Verification Tool

Tennessee makes it easy to verify a polygraph examiner's license. You can search and verify any individual or company that holds a valid state license by visiting the official verification website at verify.tn.gov [29]Verified How do I verify a Private Investigation and Polygraph license?
Confirms verify.tn.gov as the official license verification tool for polygraph examiners in Tennessee. This free, publicly accessible tool allows you to confirm that your examiner holds an active, current license issued by the Tennessee Private Investigation and Polygraph Commission.

Before scheduling an examination, always verify the examiner's license status, confirm their license number, and check for any disciplinary actions. A licensed examiner will readily provide their license number and other credentials. If an examiner is reluctant to share this information, consider it a significant red flag.

Additional Credential Checks

Beyond state licensing, look for membership in the American Polygraph Association (APA), which sets some of the highest professional standards in the field [24]Verified Polygraph Validity Research — American Polygraph Association
Confirms the 2011 meta-analysis findings of 89% accuracy for single-issue, 85% for multi-issue, and 87% combined accuracy for validated techniques across 38 studies and 3,723 examinations. The Tennessee Polygraph Association also serves as a professional resource for finding qualified examiners in the state [30]Verified Tennessee Polygraph Association
Confirms the Tennessee Polygraph Association as a professional resource for finding qualified polygraph examiners. APA membership indicates that the examiner has committed to following the organization's Standards of Practice and Code of Ethics.

For PCSOT examinations specifically, the Tennessee Sex Offender Treatment Board maintains its own list of approved polygraph examiners [36]Verified TSOTB Polygraph Examiners — Tennessee Department of Correction
Confirms Tennessee maintains a list of approved PCSOT polygraph examiners through the Sex Offender Treatment Board. Consumers seeking PCSOT services should verify that their examiner appears on this approved list. For a comparison of consumer protection frameworks across states, see our Delaware polygraph consumer protection guide.

Federal EPPA Requirements

The Employee Polygraph Protection Act (EPPA) of 1988 is a federal law that generally prevents most private employers from using polygraph tests for either pre-employment screening or during the course of employment [26]Verified Employee Polygraph Protection Act of 1988 — Wikipedia
Confirms EPPA prevents most private employers from using polygraph tests with certain exemptions for government and specific industries. Under EPPA, most private employers may not require or request any employee or job applicant to take a lie detector test, or discharge, discipline, or discriminate against anybody for refusing to take a test [26]Verified Employee Polygraph Protection Act of 1988 — Wikipedia
Confirms EPPA prevents most private employers from using polygraph tests with certain exemptions for government and specific industries.

EPPA does not cover federal, state, and local government agencies, which is why law enforcement polygraph testing remains commonplace [26]Verified Employee Polygraph Protection Act of 1988 — Wikipedia
Confirms EPPA prevents most private employers from using polygraph tests with certain exemptions for government and specific industries. In addition, the act permits polygraph tests for certain applicants at security firms (such as armored car, alarm, and guard companies) and pharmaceutical manufacturers, distributors, and dispensers [26]Verified Employee Polygraph Protection Act of 1988 — Wikipedia
Confirms EPPA prevents most private employers from using polygraph tests with certain exemptions for government and specific industries. Employers conducting ongoing investigations involving economic loss or injury to the business may also request employee polygraph testing under specific conditions [27]Verified Employee Polygraph Protection Act — U.S. Department of Labor (29 CFR Part 801)
Confirms EPPA requirements, 90-minute minimum test duration, and five-test daily maximum.

There is a $10,000 penalty for each violation of EPPA [26]Verified Employee Polygraph Protection Act of 1988 — Wikipedia
Confirms EPPA prevents most private employers from using polygraph tests with certain exemptions for government and specific industries. Tennessee's own statutory protections under TCA § 62-27-128, which prohibit employers from taking personnel action based solely on polygraph results, provide an additional layer of protection beyond what EPPA requires [11]Verified Tennessee Code § 62-27-128 — Employer Action Based on Polygraph Exam
Confirms TCA § 62-27-128 prohibition on employer personnel action based solely on polygraph results.

Tennessee-Specific Employment Protections

Tennessee law goes further than EPPA in several respects. The state's five-year lookback limitation means examiners cannot inquire about actions or activities more than five years before the examination date during employment polygraphs, except for felony convictions and Tennessee Drug Control Act violations [10]Verified Tennessee Code § 62-27-123 — Violations and Penalties (2024)
Confirms prohibited inquiries during employment polygraphs, including five-year lookback limitation and Class C misdemeanor penalties. The prohibition on inquiring into sexual orientation, religious beliefs, political affiliation, union activities, and ADA-covered disabilities during employment examinations provides robust protections [10]Verified Tennessee Code § 62-27-123 — Violations and Penalties (2024)
Confirms prohibited inquiries during employment polygraphs, including five-year lookback limitation and Class C misdemeanor penalties.

A violation of these employment polygraph restrictions is a Class C misdemeanor under Tennessee law [10]Verified Tennessee Code § 62-27-123 — Violations and Penalties (2024)
Confirms prohibited inquiries during employment polygraphs, including five-year lookback limitation and Class C misdemeanor penalties. The Tennessee Attorney General has also issued opinions regarding the discipline of employees who refuse polygraph testing, establishing important precedents for the interaction between state and federal protections [31]Verified Tennessee Attorney General Opinion — Discipline of Employees Who Refuse Polygraph Testing
Confirms Tennessee Attorney General has addressed discipline of employees who refuse polygraph testing. For related employment testing guidance, see our guide on choosing a polygraph examiner in New Jersey.

The Inadmissibility Rule

Tennessee follows the well-established rule that the results of polygraph examinations are not admissible in court proceedings. The Tennessee Court of Criminal Appeals in State v. Land (1984) stated clearly that results of polygraph examinations are not admissible on behalf of either the State or the defendant, over timely objection, even by prior stipulation [15]Verified State v. Land — Tennessee Court of Criminal Appeals (1984)
Confirms the rule that polygraph results are not admissible in Tennessee, even by prior stipulation. This rule has been reinforced by multiple Tennessee Supreme Court decisions, including State v. Hartman (2001) and State v. Pierce (2004) [32]Verified Vanderbilt Law Review — Admissibility of Polygraph Evidence in Tennessee
Confirms State v. Hartman and State v. Pierce decisions on polygraph inadmissibility in Tennessee courts.

In State v. McCaleb (2019), the Tennessee Supreme Court held that the trial court acted within its discretion in excluding from trial a defendant's videotaped post-polygraph statements that contained many references to the polygraph [16]Verified Tennessee Supreme Court Decision — State v. McCaleb (2019)
Confirms the long-standing rule on polygraph inadmissibility while noting voluntary post-polygraph statements may be admissible in certain circumstances. However, the Court also noted the long-standing principle from the Damron case that voluntary statements made in conjunction with a polygraph exam might be admissible in certain circumstances [16]Verified Tennessee Supreme Court Decision — State v. McCaleb (2019)
Confirms the long-standing rule on polygraph inadmissibility while noting voluntary post-polygraph statements may be admissible in certain circumstances. This distinction is important for both examinees and their attorneys to understand.

Strategic Value Despite Inadmissibility

Despite the inadmissibility of test results, polygraph testing retains tremendous strategic value in Tennessee. Law enforcement agencies across the state routinely use polygraphs as investigative tools to verify statements from suspects, narrow the field of suspects in investigations, and screen applicants for employment [17]Verified Use of Lie Detector Tests in Tennessee — Polygraph Admissibility Overview
Confirms that Tennessee law enforcement uses polygraphs as investigative tools and that polygraph results are not admissible even with both parties' agreement. The TBI's Criminal Investigation Division specifically conducts polygraph examinations at the request of local, state, and federal law enforcement agencies [19]Verified TBI Police Officer Hiring & Criminal Investigation Division — Tennessee Bureau of Investigation
Confirms TBI conducts background checks and polygraphs on candidates conditionally selected for employment, and the Criminal Investigation Division conducts polygraph examinations for law enforcement agencies.

Approximately 25 states accept polygraph testing as evidence in some form [33]Verified Are Polygraph Tests Admissible in Court?
Confirms approximately 25 states accept polygraph testing as evidence in some form, and the trend nationally is toward broader acceptance under specific conditions. Even in Tennessee, the Sixth Circuit's holding in Murphy v. Cincinnati Insurance Co. (1985) established that an individual's willingness to take a polygraph test may be admissible as probative of credibility [34]Verified An Insured's Willingness to Take a Polygraph Test — Admissible?
Confirms Sixth Circuit holding in Murphy v. Cincinnati Insurance Co. that willingness to take a polygraph may be admissible as probative of credibility. This makes polygraph testing a powerful tool for attorneys in the context of plea negotiations, prosecutorial decision-making, and civil litigation strategy.

Research on deception detection demonstrates why professional polygraph testing is so valuable. Tomash and Reed (2013) found that physiological responses to deception generalize across different social contexts [35]Verified The generalization of a conditioned response to deception across the public/private barrier
Peer-reviewed research on physiological responses to deception generalizing across contexts, supporting polygraph validity across different testing environments, providing scientific support for the reliability of polygraph measurements across different testing settings.

APA Meta-Analysis: The Gold Standard

The scientific foundation supporting polygraph testing is robust and continues to grow. The APA's 2011 meta-analytic survey remains the most comprehensive review of polygraph validity research. The executive summary reports that 38 studies satisfied the qualitative and quantitative requirements for inclusion, covering 32 different samples and describing the results of 45 different experiments and surveys [24]Verified Polygraph Validity Research — American Polygraph Association
Confirms the 2011 meta-analysis findings of 89% accuracy for single-issue, 85% for multi-issue, and 87% combined accuracy for validated techniques across 38 studies and 3,723 examinations. The data encompassed 295 scorers who provided 11,737 scored results from 3,723 examinations, including 6,109 scores of 2,015 confirmed deceptive examinations and 5,628 scores of 1,708 confirmed truthful exams [24]Verified Polygraph Validity Research — American Polygraph Association
Confirms the 2011 meta-analysis findings of 89% accuracy for single-issue, 85% for multi-issue, and 87% combined accuracy for validated techniques across 38 studies and 3,723 examinations.

The findings demonstrated that techniques intended for event-specific (single-issue) diagnostic testing produced an aggregated decision accuracy of 89% with a confidence interval of 83% to 95% [24]Verified Polygraph Validity Research — American Polygraph Association
Confirms the 2011 meta-analysis findings of 89% accuracy for single-issue, 85% for multi-issue, and 87% combined accuracy for validated techniques across 38 studies and 3,723 examinations. Multi-issue techniques produced an aggregated decision accuracy of 85% with a confidence interval of 77% to 93% [24]Verified Polygraph Validity Research — American Polygraph Association
Confirms the 2011 meta-analysis findings of 89% accuracy for single-issue, 85% for multi-issue, and 87% combined accuracy for validated techniques across 38 studies and 3,723 examinations. The combination of all validated techniques, excluding outlier results, produced a decision accuracy of 87% with a confidence interval of 80% to 94% [24]Verified Polygraph Validity Research — American Polygraph Association
Confirms the 2011 meta-analysis findings of 89% accuracy for single-issue, 85% for multi-issue, and 87% combined accuracy for validated techniques across 38 studies and 3,723 examinations. These findings were consistent with the National Research Council's (2003) conclusions regarding polygraph accuracy [24]Verified Polygraph Validity Research — American Polygraph Association
Confirms the 2011 meta-analysis findings of 89% accuracy for single-issue, 85% for multi-issue, and 87% combined accuracy for validated techniques across 38 studies and 3,723 examinations.

For comprehensive access to peer-reviewed polygraph research, visit our polygraph research database.

Understanding Human Deception Detection Limitations

Research consistently shows that humans are remarkably poor at detecting deception through interpersonal observation alone. Studies demonstrate that the average person is only about 54% accurate when trying to detect lies — barely better than chance [14]Verified How Private is Private Information? The Ability to Spot Deception in an Economic Game
Foundational research on human ability to detect deception in economic settings, demonstrating approximately 54% accuracy for unaided human judgment. Professionals such as police officers are no more accurate, showing approximately the same accuracy rate but with a bias toward judging people as liars [14]Verified How Private is Private Information? The Ability to Spot Deception in an Economic Game
Foundational research on human ability to detect deception in economic settings, demonstrating approximately 54% accuracy for unaided human judgment.

Belot and van de Ven's (2013) foundational research on deception detection in economic settings demonstrates the inherent difficulty of spotting deception through observation alone [14]Verified How Private is Private Information? The Ability to Spot Deception in an Economic Game
Foundational research on human ability to detect deception in economic settings, demonstrating approximately 54% accuracy for unaided human judgment. Meanwhile, Tomash and Reed's (2013) peer-reviewed study on the generalization of conditioned physiological responses to deception provides evidence that the body's deceptive reactions are consistent and measurable across contexts [35]Verified The generalization of a conditioned response to deception across the public/private barrier
Peer-reviewed research on physiological responses to deception generalizing across contexts, supporting polygraph validity across different testing environments. These findings collectively validate the necessity and value of professional polygraph instrumentation as a tool that significantly outperforms unaided human judgment. If you're interested in the psychology behind deception, read our article on why liars believe their own lies.