Polygraph Testing for Workers’ Comp Fraud: Full Guide

Defining the Problem

Workers' compensation is a state-mandated insurance program that provides medical benefits and wage replacement to employees who suffer job-related injuries or illnesses. It operates as a no-fault system — workers generally do not need to prove employer negligence to receive benefits, and employers are typically shielded from personal injury lawsuits in exchange.

Workers' compensation fraud occurs when any party — employees, employers, healthcare providers, or attorneys — makes intentional misrepresentations to obtain benefits, reduce costs, or inflate payments. The National Insurance Crime Bureau (NICB) and the Coalition Against Insurance Fraud have long identified workers' comp fraud as one of the costliest forms of insurance fraud in the United States [1]Verified Workers' Compensation Fraud In America (Task Force Report)
Confirms $34 billion total workers' comp fraud estimate ($9B claimant fraud + $25B premium fraud) from Coalition Against Insurance Fraud 2022 Task Force.

The Scale of Workers' Comp Fraud

According to the Coalition Against Insurance Fraud's 2022 Workers' Compensation Fraud Task Force Report, conducted with Colorado State University Global, workers' compensation fraud costs an estimated $34 billion annually in the United States [2]Verified Workers' Compensation Fraud In America — Full Task Force Report
Confirms $9 billion claimant fraud and $25 billion premium fraud breakdown; notes provider fraud may push total above $34 billion. This figure breaks down into $9 billion in bogus employee claims and a massive $25 billion in employer premium fraud [2]Verified Workers' Compensation Fraud In America — Full Task Force Report
Confirms $9 billion claimant fraud and $25 billion premium fraud breakdown; notes provider fraud may push total above $34 billion. Some industry analysts place the figure even higher — Insurance Business America reported in 2025 that estimates range from $35 to $44 billion annually [8]Verified Workers' Comp Fraud Costs Up to $44 Billion Each Year
Reports industry estimates of $35-44 billion annually; confirms AI and data analytics as emerging fraud-fighting tools.

The total U.S. insurance fraud burden across all lines is estimated at $308.6 billion annually [9]Verified The Impact of Insurance Fraud on the U.S. Economy
Confirms $308.6 billion total annual insurance fraud cost, with $34 billion attributed to workers' compensation, making workers' compensation one of the most significant categories. The FBI estimates the total cost of all insurance fraud, excluding health insurance, is over $40 billion a year [10]Verified Workers' Compensation Fraud Statistics
Confirms FBI estimates total insurance fraud (excluding health) at over $40 billion; provides independent analysis of fraud cost estimates. In California alone, the Department of Insurance estimates workers' compensation fraud costs the state between $1 billion and $3 billion annually [11]Verified Workers' Compensation Fraud Convictions — California Dept. of Insurance
Confirms California estimates workers' comp fraud costs $1-3 billion annually.

Employee claimant fraud — exaggerating injuries, fabricating claims, or working while collecting benefits — represents the most publicly visible form of fraud, though studies suggest the true fraud rate for employee claims is around 1-2% [12]Verified Workers Compensation Fraud — Livingston DiMarzio Brown
Confirms 1-2% employee claims fraud rate and $30 billion annual cost estimate. However, employer premium fraud — including payroll underreporting, employee misclassification, and use of shell companies — dwarfs employee fraud in dollar terms [2]Verified Workers' Compensation Fraud In America — Full Task Force Report
Confirms $9 billion claimant fraud and $25 billion premium fraud breakdown; notes provider fraud may push total above $34 billion.

Types of Workers' Comp Fraud

Employee claimant fraud includes fabricating injuries, claiming personal injuries occurred at work, exaggerating the severity of legitimate injuries, and working unreported jobs while collecting disability benefits [12]Verified Workers Compensation Fraud — Livingston DiMarzio Brown
Confirms 1-2% employee claims fraud rate and $30 billion annual cost estimate. Malingering — deliberately prolonging recovery to continue receiving benefits — is a particularly challenging form because it involves subjective symptoms.

Employer premium fraud involves misclassifying employees to obtain lower premium rates, underreporting payroll to reduce premiums, and using shell companies to reset experience modification ratings [2]Verified Workers' Compensation Fraud In America — Full Task Force Report
Confirms $9 billion claimant fraud and $25 billion premium fraud breakdown; notes provider fraud may push total above $34 billion. For example, a roofing company might classify roofers as janitors to dramatically lower premiums. Construction and agriculture are particularly common sources of premium fraud schemes [1]Verified Workers' Compensation Fraud In America (Task Force Report)
Confirms $34 billion total workers' comp fraud estimate ($9B claimant fraud + $25B premium fraud) from Coalition Against Insurance Fraud 2022 Task Force.

Provider fraud involves healthcare professionals billing for services not rendered, up-coding procedures, and operating medical mills in conjunction with unscrupulous attorneys [12]Verified Workers Compensation Fraud — Livingston DiMarzio Brown
Confirms 1-2% employee claims fraud rate and $30 billion annual cost estimate. When provider fraud is included, the Coalition believes there may be even more than $34 billion of comp fraud in America [2]Verified Workers' Compensation Fraud In America — Full Task Force Report
Confirms $9 billion claimant fraud and $25 billion premium fraud breakdown; notes provider fraud may push total above $34 billion.

Addressing Investigation Gaps

Polygraph testing addresses specific questions that surveillance, medical records, and witness interviews cannot resolve on their own. While surveillance may capture a claimant engaging in physical activity inconsistent with reported disabilities, it cannot determine intent — whether a claimant genuinely believes they are unable to work, or is deliberately deceiving their employer and insurer.

The polygraph examination focuses directly on the question of deception, providing investigators with specific information about whether a claimant is being truthful about the circumstances of their injury, the extent of their limitations, or whether they are working while collecting benefits. This makes it a uniquely valuable tool in the fraud investigator's toolkit. To understand how a polygraph works and the science behind the physiological measurements, including electrodermal activity (EDA), visit our detailed guides.

The Deterrent Effect

One of the most significant benefits of polygraph testing programs is their deterrent effect. The mere knowledge that an organization utilizes polygraph testing as part of its fraud investigation protocols discourages many individuals from filing fraudulent claims in the first place [13]Verified Why More Insurance Companies Are Turning to Professional Polygraph Services
Confirms deterrent effect of polygraph testing programs on fraudulent claims filing. Insurance companies that publicize their use of polygraph services as part of their Special Investigation Unit procedures often see a measurable reduction in suspicious claims.

The pretest interview phase of the polygraph examination frequently elicits voluntary admissions from examinees. Many individuals, when confronted with the prospect of a polygraph examination, choose to disclose information they had previously withheld. These admissions are independently valuable evidence regardless of the polygraph results themselves.

Cost-Effectiveness

A standard polygraph examination typically costs between $400 and $2,000, with a national average of approximately $800 [14]Verified How Much Does a Lie Detector Test Cost?
Confirms national average polygraph cost of $400-$1,200 with average of $800; complex exams can exceed $2,000. For workers' compensation fraud investigations, costs are often on the higher end ($800-$1,500+) due to legal compliance requirements, complex question development, and the need for detailed reports.

This cost is modest compared to the potential savings from resolving a fraudulent claim. A single fraudulent workers' comp claim can cost tens of thousands of dollars in benefits, investigation expenses, and increased premiums. For detailed pricing information, see our guide on lie detector test costs.

Overview of EPPA

The Employee Polygraph Protection Act of 1988 (EPPA) is a federal law that generally prevents private employers from using polygraph tests, either for pre-employment screening or during the course of employment [3]Verified Employee Polygraph Protection Act — Wikipedia
Confirms EPPA generally prevents employers from using polygraph tests, with specific exemptions for security firms and ongoing investigations. Under EPPA, most private employers may not require, request, suggest, or cause any employee or job applicant to take a lie detector test, or discharge, discipline, or discriminate against anyone for refusing to take a test [3]Verified Employee Polygraph Protection Act — Wikipedia
Confirms EPPA generally prevents employers from using polygraph tests, with specific exemptions for security firms and ongoing investigations.

EPPA became law on December 27, 1988, and is enforced by the U.S. Department of Labor's Wage and Hour Division [3]Verified Employee Polygraph Protection Act — Wikipedia
Confirms EPPA generally prevents employers from using polygraph tests, with specific exemptions for security firms and ongoing investigations. Civil penalties of up to $10,000 may be assessed for each violation [4]Verified Employee Polygraph Protection Act — APA Guidelines
Confirms $10,000 penalty per violation, 90-minute minimum test duration, and five-test daily limit under EPPA. Federal, state, and local government employers are exempted from the Act [3]Verified Employee Polygraph Protection Act — Wikipedia
Confirms EPPA generally prevents employers from using polygraph tests, with specific exemptions for security firms and ongoing investigations. For a thorough understanding of employee rights relating to lie detector tests, see our dedicated EPPA guide.

The Ongoing Investigation Exception

The most relevant EPPA exception for workers' compensation fraud cases is the 'ongoing investigation' exception under 29 U.S.C. § 2006(d). This provision allows private employers to request — but not require — a polygraph examination when four conditions are met [5]Verified 29 U.S.C. § 2006 — Exemptions (EPPA)
Confirms ongoing investigation exception under § 2006(d), security services exemption under § 2006(e), and drug investigation exemption under § 2006(f):

1. The test is administered in connection with an ongoing investigation involving economic loss or injury to the employer's business, such as theft, embezzlement, misappropriation, or industrial espionage [5]Verified 29 U.S.C. § 2006 — Exemptions (EPPA)
Confirms ongoing investigation exception under § 2006(d), security services exemption under § 2006(e), and drug investigation exemption under § 2006(f). 2. The employee had access to the property that is the subject of the investigation [5]Verified 29 U.S.C. § 2006 — Exemptions (EPPA)
Confirms ongoing investigation exception under § 2006(d), security services exemption under § 2006(e), and drug investigation exemption under § 2006(f). 3. The employer has reasonable suspicion that the employee was involved in the incident or activity under investigation [5]Verified 29 U.S.C. § 2006 — Exemptions (EPPA)
Confirms ongoing investigation exception under § 2006(d), security services exemption under § 2006(e), and drug investigation exemption under § 2006(f). 4. The employer provides a detailed written statement to the examinee before the test, setting forth with particularity the specific incident being investigated and the basis for testing particular employees [5]Verified 29 U.S.C. § 2006 — Exemptions (EPPA)
Confirms ongoing investigation exception under § 2006(d), security services exemption under § 2006(e), and drug investigation exemption under § 2006(f).

This written statement must be signed by a person authorized to legally bind the employer (not the polygraph examiner), and must be retained by the employer for at least three years [5]Verified 29 U.S.C. § 2006 — Exemptions (EPPA)
Confirms ongoing investigation exception under § 2006(d), security services exemption under § 2006(e), and drug investigation exemption under § 2006(f). The statement must be provided at least 48 hours before the test [3]Verified Employee Polygraph Protection Act — Wikipedia
Confirms EPPA generally prevents employers from using polygraph tests, with specific exemptions for security firms and ongoing investigations.

Additional EPPA Exemptions

EPPA also provides exemptions for security service firms — including armored car, alarm, and guard companies — to use polygraph testing for prospective employees [5]Verified 29 U.S.C. § 2006 — Exemptions (EPPA)
Confirms ongoing investigation exception under § 2006(d), security services exemption under § 2006(e), and drug investigation exemption under § 2006(f). The drug security exemption under § 2006(f) permits employers authorized to manufacture, distribute, or dispense controlled substances to use polygraph tests under specified conditions [5]Verified 29 U.S.C. § 2006 — Exemptions (EPPA)
Confirms ongoing investigation exception under § 2006(d), security services exemption under § 2006(e), and drug investigation exemption under § 2006(f).

Even under these exemptions, employees cannot be terminated, disciplined, or otherwise penalized solely on the basis of polygraph test results. Additional supporting evidence is always required [3]Verified Employee Polygraph Protection Act — Wikipedia
Confirms EPPA generally prevents employers from using polygraph tests, with specific exemptions for security firms and ongoing investigations. Under § 2007(c), polygraph examiners must maintain a $50,000 bond or equivalent professional liability coverage [7]Verified Employee Polygraph Protection Act — Full Text
Confirms $50,000 bond requirement under § 2007(c), examiner qualifications, and examinee rights provisions. For more on testing the limits of admission in polygraph exams, explore our examiner guidance.

EPPA Compliance for Workers' Comp Investigations

Workers' compensation fraud investigations present unique EPPA compliance challenges. When an employer suspects an employee of filing a fraudulent claim, the 'ongoing investigation' exception may apply — but only if the employer can demonstrate a specific economic loss (the fraudulent benefits paid), reasonable suspicion of the specific employee's involvement, and proper written notice [5]Verified 29 U.S.C. § 2006 — Exemptions (EPPA)
Confirms ongoing investigation exception under § 2006(d), security services exemption under § 2006(e), and drug investigation exemption under § 2006(f).

The Department of Labor regulations clarify that random testing is precluded by the Act, and the exemption is limited to a specific incident or activity [5]Verified 29 U.S.C. § 2006 — Exemptions (EPPA)
Confirms ongoing investigation exception under § 2006(d), security services exemption under § 2006(e), and drug investigation exemption under § 2006(f). General patterns of suspicious claims or routine inventory shortages, standing alone, are insufficient to trigger the exemption [5]Verified 29 U.S.C. § 2006 — Exemptions (EPPA)
Confirms ongoing investigation exception under § 2006(d), security services exemption under § 2006(e), and drug investigation exemption under § 2006(f). However, when combined with evidence pointing to a specific employee's involvement in a specific fraudulent claim, the exemption may be available.

The key distinction in workers' comp cases is the relationship between the investigating party and the claimant. When an insurance company SIU — rather than the employer — is investigating a claimant, the applicability of EPPA becomes complex, as EPPA specifically governs the employer-employee relationship.

States That Prohibit Employer Polygraph Use

Several states impose restrictions that go beyond the federal EPPA. Five states have complete prohibitions on polygraph usage by employers, including both public and private employers: Massachusetts, Michigan, Minnesota, New Jersey, and Oregon [15]Verified Pretty Legal Liars: Polygraph Pre-Employment Screening and Admissibility
Confirms five states (Massachusetts, Michigan, Minnesota, New Jersey, Oregon) have complete employer polygraph prohibitions. Additional states such as Rhode Island, Delaware, Maryland, Iowa, and California impose strict restrictions that effectively eliminate or severely limit employer polygraph use [16]Verified Polygraph — Wikipedia
Confirms states prohibiting employer polygraph use including Rhode Island, Massachusetts, Maryland, New Jersey, Oregon, Delaware, and Iowa.

California stands out for its absolute ban on polygraph testing under Labor Code Section 432.2, which prohibits employers from requiring, requesting, or even suggesting polygraph tests for any position — including armed security guards [17]Verified State Laws on Polygraphs and Lie Detector Tests — HRTrainingClasses.com
Confirms California's absolute ban under Labor Code Section 432.2 and restrictions in Massachusetts, Michigan, and New Jersey. This goes beyond the EPPA federal exemptions and means that even employers who would qualify for federal exemptions cannot use polygraph tests in California.

Admissibility of Polygraph Results

New Mexico is the only U.S. state that generally allows polygraph results in judicial processes [18]Verified State-by-State Polygraph Rules & Lie Detector Tests in US
Confirms New Mexico as only state generally allowing polygraph results in judicial processes; details state licensing requirements. Under New Mexico Rule of Evidence 11-707(C), the opinion of a polygraph examiner may, at the discretion of the trial judge, be admitted as evidence regarding the truthfulness of any witness [19]Verified Lee v. Martinez — New Mexico Supreme Court
Confirms New Mexico Supreme Court held polygraph results sufficiently reliable to be admitted under Rule 11-702; 27 states apply per se exclusion. The New Mexico Supreme Court held in Lee v. Martinez (2004) that polygraph examination results are sufficiently reliable to be admitted under Rule 11-702, provided the expert is qualified and the examination was conducted in accordance with Rule 11-707 [19]Verified Lee v. Martinez — New Mexico Supreme Court
Confirms New Mexico Supreme Court held polygraph results sufficiently reliable to be admitted under Rule 11-702; 27 states apply per se exclusion.

Approximately 15 states allow polygraph results by stipulation — meaning both parties must agree before the test to have results admitted [20]Verified The Polygraph: A Criminal Defendant's Friend or Foe?
Confirms approximately 15 states allow polygraph results by stipulation; only New Mexico allows routine admission. Twenty-seven states and the District of Columbia apply a per se rule of exclusion of polygraph evidence for all purposes [19]Verified Lee v. Martinez — New Mexico Supreme Court
Confirms New Mexico Supreme Court held polygraph results sufficiently reliable to be admitted under Rule 11-702; 27 states apply per se exclusion. States like New York, Texas, Pennsylvania, and Illinois find polygraph tests completely inadmissible, even with mutual consent [18]Verified State-by-State Polygraph Rules & Lie Detector Tests in US
Confirms New Mexico as only state generally allowing polygraph results in judicial processes; details state licensing requirements.

In the workers' compensation context, even where polygraph results are inadmissible as direct evidence, they can still influence claim settlements, direct further investigation, and — most significantly — produce voluntary admissions during the pretest interview that are independently admissible.

Special Investigation Units (SIUs)

Insurance company Special Investigation Units are dedicated teams tasked with detecting, investigating, and preventing insurance fraud [21]Verified SIU and Fraud Investigation
Confirms SIU roles in detecting, preventing, and investigating insurance fraud using surveillance, interviews, and forensic analysis. SIU investigators typically have backgrounds in law enforcement, forensic accounting, or specialized fraud detection [21]Verified SIU and Fraud Investigation
Confirms SIU roles in detecting, preventing, and investigating insurance fraud using surveillance, interviews, and forensic analysis. New York Insurance Law Section 409 and similar statutes in other states require insurers to file fraud prevention plans and establish SIUs separate from claims and underwriting functions [22]Verified FAQ: Fraud Prevention Plans and SIUs — NY DFS
Confirms NY Insurance Law Section 409 requirement for fraud prevention plans and separate SIU establishment.

SIUs deploy a range of investigative tools including surveillance, interviews, financial audits, medical record reviews, and polygraph examinations [21]Verified SIU and Fraud Investigation
Confirms SIU roles in detecting, preventing, and investigating insurance fraud using surveillance, interviews, and forensic analysis. The Coalition Against Insurance Fraud's 2022 Insurer SIU Benchmarking Study found that participating insurers saw an increase in SIU staff of 1.4% from 2021 to 2022 [23]Verified Facts + Statistics: Insurance Fraud — Insurance Information Institute
Confirms 80% of insurers use predictive modeling (up from 55% in 2018); SIU staff grew 1.4% from 2021-2022. Approximately 80% of respondents reported using predictive modeling to detect fraud, up from 55% in 2018 [23]Verified Facts + Statistics: Insurance Fraud — Insurance Information Institute
Confirms 80% of insurers use predictive modeling (up from 55% in 2018); SIU staff grew 1.4% from 2021-2022.

When an SIU investigates a workers' comp claimant, the legal relationship differs from a direct employer-employee investigation. Because EPPA governs the employer-employee relationship, an insurer investigating a claimant may have more latitude to request a polygraph examination, though this interpretation varies by jurisdiction.

When Polygraphs Are Deployed

In workers' comp fraud investigations, polygraph testing is typically deployed when other investigative methods have produced suspicious but inconclusive results. Common trigger scenarios include:

Surveillance revealing activity inconsistent with reported disabilities. Medical examinations producing results that conflict with the claimant's reported symptoms. Witness statements contradicting the claimant's account of the injury. Claims history databases revealing patterns of prior suspicious claims. Financial analysis showing unexplained income during the disability period.

The polygraph examination serves to focus and clarify the investigation, either confirming suspicions that warrant denial of the claim or clearing the claimant and allowing the claim to proceed. For employers dealing with theft-related scenarios, our guides on warehouse theft investigation, construction site theft, restaurant employee theft, and jewelry store theft provide industry-specific guidance.

Pre-Examination Requirements

Before a polygraph examination can be administered in a workers' comp fraud investigation, several legal and procedural requirements must be satisfied:

Step 1 — Legal Review: The employer or insurer consults legal counsel to determine whether EPPA or state law permits the examination and what specific compliance requirements must be met.

Step 2 — Written Notice: If the employer is conducting the investigation under the EPPA ongoing investigation exception, they must provide a detailed written statement at least 48 hours before the test. This statement must identify the specific economic loss, describe the employee's access to the property under investigation, and detail the basis for reasonable suspicion [3]Verified Employee Polygraph Protection Act — Wikipedia
Confirms EPPA generally prevents employers from using polygraph tests, with specific exemptions for security firms and ongoing investigations.

Step 3 — Examiner Selection: The polygraph examiner must hold appropriate state licensure, maintain a $50,000 bond or professional liability coverage as required under EPPA § 2007(c), and have experience with EPPA-compliant fraud examinations [7]Verified Employee Polygraph Protection Act — Full Text
Confirms $50,000 bond requirement under § 2007(c), examiner qualifications, and examinee rights provisions.

The Examination Process

Step 4 — Pretest Interview: The examiner conducts a thorough pretest interview lasting 45-90 minutes, during which the specific issues are discussed, test questions are reviewed, and the examinee's physiological baseline is established. This phase frequently elicits voluntary admissions that can be more valuable than the polygraph results themselves.

Step 5 — Chart Collection: The examiner administers multiple polygraph charts, each containing relevant questions about the specific fraud allegation, comparison questions, and irrelevant baseline questions. EPPA requires that no test be less than 90 minutes in total duration [4]Verified Employee Polygraph Protection Act — APA Guidelines
Confirms $10,000 penalty per violation, 90-minute minimum test duration, and five-test daily limit under EPPA, and examiners may not conduct more than five tests in a single calendar day [4]Verified Employee Polygraph Protection Act — APA Guidelines
Confirms $10,000 penalty per violation, 90-minute minimum test duration, and five-test daily limit under EPPA.

Step 6 — Data Analysis: The examiner analyzes the physiological data using validated scoring methods. Computerized evaluations have been shown to achieve accuracy of at least 90%, equaling or exceeding human scorers [24]Verified Human Versus Computerized Evaluations of Polygraph Data in a Laboratory Setting
Found computerized evaluations achieved accuracy of at least 90%, equaling or exceeding human scorers.

Step 7 — Post-Test Interview: The examiner informs the examinee of the results and provides an opportunity to explain any physiological responses [3]Verified Employee Polygraph Protection Act — Wikipedia
Confirms EPPA generally prevents employers from using polygraph tests, with specific exemptions for security firms and ongoing investigations. Under EPPA, any opinion of deception or non-deception must be provided in writing [4]Verified Employee Polygraph Protection Act — APA Guidelines
Confirms $10,000 penalty per violation, 90-minute minimum test duration, and five-test daily limit under EPPA.

Step 8 — Report and Follow-Up: The examiner produces a detailed report for the requesting party, which then integrates the results with other investigative findings to make informed decisions about the claim.

Your Rights Under EPPA

If you are asked to take a polygraph as part of a workers' compensation investigation, you have significant legal protections under EPPA:

Right to Refuse: You always have the right to refuse a polygraph test. Under EPPA, your employer cannot terminate, discipline, or otherwise retaliate against you solely for refusing [3]Verified Employee Polygraph Protection Act — Wikipedia
Confirms EPPA generally prevents employers from using polygraph tests, with specific exemptions for security firms and ongoing investigations. However, the investigation may continue using other methods.

Right to Written Notice: You must receive written notice at least 48 hours before the test, including the specific incident being investigated, the basis for testing you specifically, and a list of prohibited question topics [3]Verified Employee Polygraph Protection Act — Wikipedia
Confirms EPPA generally prevents employers from using polygraph tests, with specific exemptions for security firms and ongoing investigations.

Right to Legal Counsel: You have the right to consult with legal counsel or an employee representative before each phase of the test [3]Verified Employee Polygraph Protection Act — Wikipedia
Confirms EPPA generally prevents employers from using polygraph tests, with specific exemptions for security firms and ongoing investigations.

Right to Terminate: You may terminate the examination at any time during the testing process [3]Verified Employee Polygraph Protection Act — Wikipedia
Confirms EPPA generally prevents employers from using polygraph tests, with specific exemptions for security firms and ongoing investigations.

Protection from Sole-Basis Action: Even if you take the test and results indicate deception, you cannot be terminated, disciplined, or denied benefits solely on the basis of the polygraph results. Additional supporting evidence is always required [3]Verified Employee Polygraph Protection Act — Wikipedia
Confirms EPPA generally prevents employers from using polygraph tests, with specific exemptions for security firms and ongoing investigations.

Right to Results: You have the right to be informed of the results and to be given an opportunity to explain any physiological responses [4]Verified Employee Polygraph Protection Act — APA Guidelines
Confirms $10,000 penalty per violation, 90-minute minimum test duration, and five-test daily limit under EPPA.

For a comprehensive overview of employee rights relating to lie detector tests and what to do if you're accused of stealing at work, visit our detailed guides.

What Happens If You Refuse

Refusing a polygraph test does not end the investigation. The employer or insurer can continue using other methods — surveillance, independent medical examinations, witness interviews, and database searches — to investigate the claim. In some jurisdictions, a refusal combined with other evidence may be considered as part of the overall investigation.

However, an employee's refusal itself cannot be the basis for any adverse employment action under EPPA [3]Verified Employee Polygraph Protection Act — Wikipedia
Confirms EPPA generally prevents employers from using polygraph tests, with specific exemptions for security firms and ongoing investigations. If your employer terminates you, reduces your hours, or otherwise retaliates after you refuse a polygraph, you may have grounds for a civil action under EPPA, with potential remedies including reinstatement, back pay, and attorney's fees [3]Verified Employee Polygraph Protection Act — Wikipedia
Confirms EPPA generally prevents employers from using polygraph tests, with specific exemptions for security firms and ongoing investigations. If you're polygraph tested after being fired, understand your options for clearing your name.

The APA Meta-Analysis (2011)

The American Polygraph Association conducted an exhaustive meta-analysis completed in late 2011, reviewing all peer-reviewed publications on polygraph testing that met APA Standards of Practice [6]Verified Polygraph Validity Research — APA Meta-Analysis
Confirms 89% event-specific accuracy, 87% overall accuracy with 80-94% confidence interval, from meta-analysis of 38 studies and 3,723 examinations. The study analyzed 38 studies involving 32 different samples, 45 experiments and surveys, with 295 scorers providing 11,737 scored results from 3,723 examinations [6]Verified Polygraph Validity Research — APA Meta-Analysis
Confirms 89% event-specific accuracy, 87% overall accuracy with 80-94% confidence interval, from meta-analysis of 38 studies and 3,723 examinations.

The results demonstrated strong accuracy: techniques intended for event-specific (single-issue) diagnostic testing — the category most relevant to workers' comp fraud investigations — produced an aggregated decision accuracy of 89%, with a confidence interval of 83% to 95% and an inconclusive rate of 11% [6]Verified Polygraph Validity Research — APA Meta-Analysis
Confirms 89% event-specific accuracy, 87% overall accuracy with 80-94% confidence interval, from meta-analysis of 38 studies and 3,723 examinations. Multi-issue polygraph techniques produced a decision accuracy of 85% (CI 77%-93%) [6]Verified Polygraph Validity Research — APA Meta-Analysis
Confirms 89% event-specific accuracy, 87% overall accuracy with 80-94% confidence interval, from meta-analysis of 38 studies and 3,723 examinations. The combination of all validated techniques produced an overall decision accuracy of 87% (CI 80%-94%) with a 13% inconclusive rate [6]Verified Polygraph Validity Research — APA Meta-Analysis
Confirms 89% event-specific accuracy, 87% overall accuracy with 80-94% confidence interval, from meta-analysis of 38 studies and 3,723 examinations.

The National Research Council Report (2003)

The National Research Council's 2003 report, 'The Polygraph and Lie Detection,' remains the most comprehensive independent scientific review of polygraph testing [25]Verified The Polygraph and Lie Detection — National Research Council
Confirms median accuracy index of.89 for field studies; specific-incident polygraphs discriminate lying from truth at rates 'well above chance'. The NRC's quantitative assessment found a median accuracy index (A) of 0.89 for seven field study datasets [25]Verified The Polygraph and Lie Detection — National Research Council
Confirms median accuracy index of.89 for field studies; specific-incident polygraphs discriminate lying from truth at rates 'well above chance'. The two highest-quality field studies produced accuracy index values of 0.91 and 0.89, close to this median [25]Verified The Polygraph and Lie Detection — National Research Council
Confirms median accuracy index of.89 for field studies; specific-incident polygraphs discriminate lying from truth at rates 'well above chance'.

The NRC concluded that, in populations untrained in countermeasures, specific-incident polygraph tests can discriminate lying from truth-telling at rates "well above chance, though well below perfection" [25]Verified The Polygraph and Lie Detection — National Research Council
Confirms median accuracy index of.89 for field studies; specific-incident polygraphs discriminate lying from truth at rates 'well above chance'. Workers' comp fraud investigations are specific-incident tests — precisely the category where polygraph testing demonstrates its strongest performance.

The Honts (2021) Comprehensive Meta-Analysis

The largest meta-analysis ever conducted on the Comparison Question Test, published in Applied Cognitive Psychology by Charles Honts and colleagues, analyzed 138 datasets and found a meta-analytic effect size of 0.69 including inconclusive outcomes [26]Verified A Comprehensive Meta-Analysis of the Comparison Question Polygraph Test
Largest CQT meta-analysis (138 datasets); found motivation positively correlates with accuracy; no publication bias detected. The study found that motivation level had a positive linear relationship with accuracy — meaning that real-world fraud investigations, where stakes are high, can be expected to produce even stronger accuracy than laboratory studies [26]Verified A Comprehensive Meta-Analysis of the Comparison Question Polygraph Test
Largest CQT meta-analysis (138 datasets); found motivation positively correlates with accuracy; no publication bias detected. The researchers concluded that the CQT can be accurate, experimental studies are generalizable, and no publication bias was detected [26]Verified A Comprehensive Meta-Analysis of the Comparison Question Polygraph Test
Largest CQT meta-analysis (138 datasets); found motivation positively correlates with accuracy; no publication bias detected.

Additional meta-analytic work by Vrij, Mann, and Fisher (2008) found overall accuracy estimates above 85% across studies and identified important moderator variables including examiner training and testing protocols [27]Verified A Meta-Analysis of the Comparison Question Polygraph Test: Moderator Effects
Found overall CQT accuracy estimates above 85%; identified examiner training and testing protocols as important moderator variables. The pioneering meta-analysis by Kircher, Horowitz, and Raskin (1988) found significant moderator effects for subject type, incentives, and decision policy [28]Verified Meta-Analysis of the Comparison Question Test
First CQT meta-analysis; found significant moderator effects for subject type, incentives, and decision policy.

Why Workers' Comp Fraud Testing Achieves High Accuracy

Workers' compensation fraud investigations represent the ideal conditions for polygraph accuracy for several reasons. First, they involve specific, well-defined incidents — a particular injury claim, a specific period of alleged disability, or a concrete allegation of working while collecting benefits. The APA meta-analysis confirmed that event-specific diagnostic testing achieves the highest accuracy levels at 89% [6]Verified Polygraph Validity Research — APA Meta-Analysis
Confirms 89% event-specific accuracy, 87% overall accuracy with 80-94% confidence interval, from meta-analysis of 38 studies and 3,723 examinations.

Second, real-world fraud investigations involve high-stakes scenarios where subjects are highly motivated. The Honts (2021) meta-analysis confirmed that higher motivation correlates with higher accuracy [26]Verified A Comprehensive Meta-Analysis of the Comparison Question Polygraph Test
Largest CQT meta-analysis (138 datasets); found motivation positively correlates with accuracy; no publication bias detected. Third, modern validated testing techniques combined with computerized scoring systems — which Kircher and Raskin (1988) demonstrated achieve accuracy of at least 90% [24]Verified Human Versus Computerized Evaluations of Polygraph Data in a Laboratory Setting
Found computerized evaluations achieved accuracy of at least 90%, equaling or exceeding human scorers — provide robust and reliable results.

The theoretical mechanisms underlying this accuracy have been investigated by Offe and Offe (2007), who examined the role of comparison questions in calibrating physiological responses [29]Verified The Comparison Question Test: Does It Work and If So How?
Investigated theoretical mechanisms underlying CQT effectiveness; examined role of comparison questions in calibrating physiological responses. Horowitz et al. (1997) provided empirical support showing that comparison questions produced different physiological patterns for innocent versus guilty subjects [30]Verified The Role of Comparison Questions in Physiological Detection of Deception
Mock crime study (120 participants) found comparison questions produced different physiological patterns for innocent vs. guilty subjects, and Honts (1999) demonstrated that between-chart discussion of comparison questions significantly improved CQT accuracy [31]Verified The Discussion of Comparison Questions Between List Repetitions Is Associated with Increased Test Accuracy
Demonstrated between-chart discussion of comparison questions significantly improved CQT accuracy; became standard practice. Field studies by Ginton (2017) provided evidence for the practical effectiveness of different comparison question types in real criminal investigations [32]Verified Examining Different Types of Comparison Questions in a Field Study of CQT Polygraph Technique
Field study providing evidence for practical effectiveness of both exclusive and non-exclusive comparison questions in real investigations.

General Admissibility Rules

In most U.S. jurisdictions, polygraph results are not admissible as evidence in court proceedings or administrative hearings. Twenty-seven states and the District of Columbia apply a per se rule of exclusion [19]Verified Lee v. Martinez — New Mexico Supreme Court
Confirms New Mexico Supreme Court held polygraph results sufficiently reliable to be admitted under Rule 11-702; 27 states apply per se exclusion. About 15 states allow polygraph evidence by stipulation — both parties must agree before the test is administered [20]Verified The Polygraph: A Criminal Defendant's Friend or Foe?
Confirms approximately 15 states allow polygraph results by stipulation; only New Mexico allows routine admission. New Mexico stands alone in allowing routine admission of polygraph evidence, subject to judicial discretion under Rule 11-707 [19]Verified Lee v. Martinez — New Mexico Supreme Court
Confirms New Mexico Supreme Court held polygraph results sufficiently reliable to be admitted under Rule 11-702; 27 states apply per se exclusion.

The Frye standard, established in 1923, historically excluded polygraph evidence on the grounds that it had not gained general acceptance in the relevant scientific community [19]Verified Lee v. Martinez — New Mexico Supreme Court
Confirms New Mexico Supreme Court held polygraph results sufficiently reliable to be admitted under Rule 11-702; 27 states apply per se exclusion. The Daubert standard, established by the Supreme Court in 1993, opened a theoretical door for polygraph admissibility by shifting to a more flexible, science-based standard. Some courts, such as the U.S. District Court in United States v. Galbreth (D.N.M. 1995), have admitted polygraph evidence after conducting Daubert hearings [19]Verified Lee v. Martinez — New Mexico Supreme Court
Confirms New Mexico Supreme Court held polygraph results sufficiently reliable to be admitted under Rule 11-702; 27 states apply per se exclusion.

Practical Impact Beyond Admissibility

While formal admissibility limitations are significant, the practical impact of polygraph testing in workers' comp cases extends well beyond the courtroom:

Claim Settlement Influence: Polygraph results, even when inadmissible as evidence, can significantly influence how claims are resolved. A clear deception indication supported by other evidence often leads to claim denials or settlements. A clear truthful indication can help legitimate claimants receive their benefits more quickly.

Investigative Direction: Polygraph results help investigators prioritize resources. If a claimant passes a polygraph examination, resources can be redirected to more promising leads. If deception is indicated, investigators can focus their efforts on corroborating specific areas of concern.

Admissions and Confessions: Voluntary admissions made during the pretest interview or post-test interview are independently admissible in virtually all jurisdictions. These admissions are often the most valuable outcome of the polygraph process.

Deterrence: The knowledge that polygraph testing is part of the investigation protocol deters many individuals from pursuing or continuing fraudulent claims [13]Verified Why More Insurance Companies Are Turning to Professional Polygraph Services
Confirms deterrent effect of polygraph testing programs on fraudulent claims filing. Learn more about why employees lie at work and how polygraph testing helps in our business polygraph guide.

Building a Multi-Layered Approach

Polygraph testing is most effective when used as part of a comprehensive investigation strategy. Key complementary methods include:

Surveillance and Activity Monitoring: Covert video surveillance can capture claimants engaging in activities inconsistent with their reported disabilities. Social media investigation has become increasingly valuable as claimants sometimes post photos or updates contradicting their claims.

Independent Medical Examinations (IMEs): A physician who did not treat the claimant provides an independent assessment of the injury's nature, extent, and consistency with reported symptoms.

Background and Claims History Analysis: Searching databases for prior claims history, criminal records, and financial status can reveal patterns consistent with serial fraud.

Data Analytics and AI: Insurance companies are increasingly leveraging predictive modeling and AI-powered systems to detect potential fraud before it matures [8]Verified Workers' Comp Fraud Costs Up to $44 Billion Each Year
Reports industry estimates of $35-44 billion annually; confirms AI and data analytics as emerging fraud-fighting tools. These tools process vast amounts of claims data to identify anomalies and assign risk scores [8]Verified Workers' Comp Fraud Costs Up to $44 Billion Each Year
Reports industry estimates of $35-44 billion annually; confirms AI and data analytics as emerging fraud-fighting tools. The Coalition Against Insurance Fraud's study found that 80% of insurers now use predictive modeling, up from 55% in 2018 [23]Verified Facts + Statistics: Insurance Fraud — Insurance Information Institute
Confirms 80% of insurers use predictive modeling (up from 55% in 2018); SIU staff grew 1.4% from 2021-2022.

For a broader perspective on polygraph testing for business and employee reliability testing, explore our comprehensive business guides.