Security firms cannot afford a weak link; this industry guide explains why they turn to the lie detector test to screen personnel and protect high-stakes operations.
Security is a high-stakes industry where insider threats, criminal infiltration, and employee integrity can determine outcomes worth millions of dollars and even lives. This comprehensive guide explains why polygraph testing is standard practice across security firms, what the law allows, how exams are conducted, and what employees and candidates can expect.
TL;DR — The Short Version
- Security firms are specifically exempt from the EPPA under Section 7(e) (29 U.S.C. § 2006(e)), allowing them to polygraph candidates and employees as a standard business practice.
- The industry uses three exam types: pre-employment screening, specific-incident testing (after a breach or crime), and random/periodic testing at regular intervals.
- Polygraph testing is a primary tool for preventing criminal infiltration and insider threats — organizations now spend an average of $17.4 million annually on insider threat incidents.
- The APA's 2011 meta-analysis of 38 qualifying studies found a decision accuracy rate of approximately 87% for validated polygraph techniques, with some specific techniques reaching 89–92%.
- Employment consequences for security workers can include termination based on polygraph results, and criminal matters may be referred to law enforcement.
- Reputable security firms develop polygraph policies in collaboration with employment attorneys and professional examiners to ensure legal defensibility across all jurisdictions where they operate.
Who This Guide Is For
- Candidates applying for security guard, bodyguard, or private security positions
- Current security industry employees subject to periodic or random polygraph testing
- Security firm owners and HR managers building polygraph policies
- Attorneys advising security companies on EPPA compliance and labor law
- Anyone transitioning from law enforcement to private security roles
- Polygraph examiners expanding into the security sector market
Types of Security Firms That Use Polygraph Testing
Property and Asset Management Security
Property security firms provide teams to protect industrial facilities, commercial buildings, warehouses, retail centers, and residential estates. These organizations bear responsibility for preventing theft, vandalism, unauthorized entry, and property damage. In industrial settings, security teams may safeguard manufacturing equipment worth millions of dollars. In commercial distribution centers, they protect inventory representing entire business livelihoods.
The U.S. security services market reached approximately $47.8 billion in 2023 Verified Lie Detector Test in Maryland
Confirms Maryland polygraph violation is a misdemeanor with fine not exceeding $100.
For security firms operating across multiple states, the regulatory landscape can be complex. An employer that is EPPA-exempt at the federal level may still face restrictions in certain jurisdictions [17]Verified 29 CFR Part 801 — Application of the EPPA of 1988
Confirms Section 10 of EPPA does not preempt more restrictive state or local laws. This is why reputable security companies work closely with employment attorneys. Understanding your rights regarding employer polygraph requests is important in every state where operations take place.
Types of Polygraph Exams Used by Security Services
Pre-Employment Screening
Pre-employment polygraph exams serve as a gateway filter for all candidates. The security firm requires candidates to pass a polygraph as a condition of employment. This screening aims to identify applicants with criminal histories, undisclosed associations with criminal organizations, active drug use, serious financial problems that could make them vulnerable to corruption, or patterns of dishonesty.
Unlike private-sector employers covered by the EPPA, security firms can use polygraph results to reject applicants outright [15]Verified 29 CFR § 801.14 — Exemption for Employers Providing Security Services
Confirms Section 7(e) security services exemption details, 50% revenue threshold, and scope limitations. A candidate who declines the test is typically eliminated from consideration immediately. However, research on the accuracy of security screening polygraph examinations has shown asymmetry in results — one DoDPI study found 94.9% accuracy for innocent examinees but only 43.2% accuracy for guilty examinees [22]Verified Studies of the Accuracy of Security Screening Polygraph Examinations
Found 94.9% accuracy for innocent examinees but only 43.2% for guilty in security screening, underscoring the importance of using polygraph results as one component of a comprehensive vetting process rather than as a sole determinant. For more on pre-employment contexts, see our guide on screening polygraph in public safety employment.
Specific-Incident Testing
When a security incident occurs — a robbery at a guarded facility, an assault on a protected client, a data breach, or missing inventory — the employer may order specific-incident polygraph examinations for all personnel who had access or involvement. These tests focus narrowly on the event: Did the employee have prior knowledge of the attack? Did they provide information to perpetrators? Were they derelict in their duties? Did they personally benefit?
Specific-incident tests are the most intense form of security polygraph because they investigate potential criminal complicity. The National Research Council noted that specific-incident polygraph tests can discriminate lying from truth telling at rates well above chance [7]Verified The Polygraph and Lie Detection
Confirms NAS found polygraph has some utility for deterrence and security screening but with limited accuracy basis, and that accuracy for specific-incident testing is generally higher than for screening purposes [7]Verified The Polygraph and Lie Detection
Confirms NAS found polygraph has some utility for deterrence and security screening but with limited accuracy basis. The results may be shared with law enforcement if criminal activity is confirmed. Businesses facing cash theft investigations frequently rely on specific-incident testing.
Random and Periodic Testing
Many security firms institute regular polygraph programs where employees are tested at scheduled intervals — quarterly, semi-annually, or annually — or through random selection. Random testing creates an ongoing deterrent effect: employees never know when they might be selected, discouraging misconduct between scheduled tests.
Research on the issue of multiple testing in polygraph screening has examined the statistical implications of repeated testing on the same personnel [23]Verified The Issue of Multiple Testing in Polygraph Screening — Implications for Internal Security
Examines statistical implications of repeated polygraph testing on same personnel in security contexts, highlighting the importance of proper test design when implementing periodic programs. Questions during periodic tests may cover associations with criminal elements, unreported financial difficulties, substance abuse, unauthorized disclosure of client information, and any changes in circumstances that could compromise an employee's security role. Understanding what can disqualify someone from a polygraph test helps both employers and employees prepare appropriately.
How Security Firms Implement a Polygraph Policy
Engaging Legal Counsel
The first step in implementing a polygraph program is retaining an employment attorney experienced in EPPA compliance and security industry regulations. This attorney will research applicable federal and state laws, draft the written polygraph policy, create employee notification documents, establish procedures for handling exam results and disputes, and ensure the program can withstand legal challenges. The attorney's involvement protects the firm from liability and ensures employees' legal rights are respected, even within the EPPA exemption framework.
Given that some states like Massachusetts effectively prohibit all employer polygraph use and Maryland restricts it [18]Verified Massachusetts General Laws Chapter 149, Section 19B
Confirms Massachusetts broadly prohibits employer use of lie detector tests with limited law enforcement exception [20]Verified Maryland General Employment Law Section 3-702
Confirms Maryland prohibits employers from requiring polygraph as condition of employment, multi-state operations require careful legal analysis. Firms expanding internationally should also research local regulations — for example, polygraph testing in Namibia's mining and security sector and polygraph use in Ghana operate under entirely different legal frameworks.
Contracting a Qualified Polygraph Firm
The employer engages an independent polygraph examination firm to assist with policy development and exam administration. The polygraph firm assigns a professional examiner who works with the attorney to establish exam parameters, including question types, testing frequency, procedures for handling inconclusive results, and protocols for maintaining exam confidentiality.
Critically, the polygraph examiner must be independent of the employer to maintain the integrity of the testing process. Under the EPPA, examiners must maintain a valid license in the state where the test is conducted (if required) and maintain a minimum of a $50,000 bond or equivalent professional liability coverage [24]Verified 29 U.S.C. § 2007 — EPPA Rights of Examinees
Confirms examinee rights including right to terminate test and prohibition on discriminatory questions. The American Polygraph Association has consistently supported licensing efforts and encourages proper qualifications for polygraph examiners [16]Verified Polygraph Frequently Asked Questions
Confirms APA positions on accuracy calculation, examiner requirements, EPPA exemptions, and exam procedures. Examiners should graduate from an APA-approved school — those interested in professional development can explore PEAK CATC polygraph training courses.
Developing Question Sets and Employee Notification
The examiner collaborates with the attorney and employer to develop standardized question sets for each examination type. Pre-employment questions focus on background integrity, while specific-incident questions target the event under investigation. All questions must be relevant, legally permissible, non-discriminatory, closed-ended (requiring yes or no answers), and free from ambiguity.
Questions about race, religion, political beliefs, sexual orientation, union membership, or other protected characteristics are strictly prohibited under the EPPA [24]Verified 29 U.S.C. § 2007 — EPPA Rights of Examinees
Confirms examinee rights including right to terminate test and prohibition on discriminatory questions. Even though security firms are EPPA-exempt, best practices require clear written policies distributed to all employees and candidates explaining when testing may be required, what topics the examination will cover, what rights the employee retains, how results will be used, and the consequences of refusal or failure. Transparency builds trust and reduces legal disputes. Learning more about cultivating trust in the workplace with lie detector tests can help firms design more effective policies.
What Questions Are Asked During a Security Firm Polygraph?
Common Pre-Employment Screening Questions
Pre-employment polygraph exams for security candidates typically address criminal history, integrity, and fitness for duty. Common question areas include: Have you ever been accused, arrested, or charged with a crime? Have you ever lied to a previous employer? Did you lie on your job application or resume? Do you intend to use your position for any purpose other than those authorized by your employer? Have you used illegal drugs or misused prescription medications within a specified timeframe?
All questions share certain characteristics: they are short, direct, closed-ended (yes/no), specific to the examination purpose, and free from ambiguity. The examiner develops these questions in advance, and the examinee reviews them before the examination begins. This review process is an important procedural safeguard that helps ensure accurate results. To understand more about the examination experience and potential concerns, see do employers use polygraph results to discriminate.
Specific-Incident and Periodic Test Questions
Specific-incident questions focus narrowly on the event under investigation: Did the employee have prior knowledge of the incident? Did they communicate with any outside parties about security operations? Did they personally benefit from the event? Were they derelict in their duties?
Periodic test questions may cover associations with criminal elements, unreported financial difficulties, substance abuse, unauthorized disclosure of client information, and any changes in circumstances that could compromise the employee's security role. Understanding your legal options is important — employees should know whether they can refuse a lie detector test and what consequences may follow.
The Polygraph Exam Process: Step-by-Step
Pre-Test Phase
The polygraph examination typically begins with a pre-test interview lasting 30 to 90 minutes. During this phase, the examiner explains the polygraph process, reviews the candidate's background information, discusses the questions that will be asked, and establishes a baseline for physiological responses. The examiner attaches sensors to measure respiratory activity (corrugated rubber tubes or electronic sensors over the chest and abdominal area), sweat gland activity (two small metal plates or adhesive electrodes on the fingers), and cardiovascular activity (a blood pressure cuff or similar device) [25]Verified Polygraph Frequently Asked Questions — Instruments
Confirms polygraph sensor attachments, procedures, and that voice stress analyzers are not polygraphs. Some instruments also use a finger plethysmograph to monitor blood volume or motion sensors to detect general movements [25]Verified Polygraph Frequently Asked Questions — Instruments
Confirms polygraph sensor attachments, procedures, and that voice stress analyzers are not polygraphs.
This pre-test conversation also serves to address the examinee's concerns and ensure informed consent. The examinee must be permitted to terminate the test at any time [24]Verified 29 U.S.C. § 2007 — EPPA Rights of Examinees
Confirms examinee rights including right to terminate test and prohibition on discriminatory questions.
In-Test and Post-Test Phases
During the in-test phase, the examiner asks the prepared questions while the polygraph instrument records physiological responses. A typical test session involves multiple chart collections, where the same questions are repeated in different sequences. Under EPPA requirements, no test may be less than 90 minutes in duration [16]Verified Polygraph Frequently Asked Questions
Confirms APA positions on accuracy calculation, examiner requirements, EPPA exemptions, and exam procedures, and examiners may not conduct more than five polygraph tests during one calendar day [16]Verified Polygraph Frequently Asked Questions
Confirms APA positions on accuracy calculation, examiner requirements, EPPA exemptions, and exam procedures.
In the post-test phase, the examiner analyzes the charts, applies standardized scoring algorithms, and reaches a determination: no deception indicated, deception indicated, or inconclusive. The employee is informed of the results and given an opportunity to explain any reactions [16]Verified Polygraph Frequently Asked Questions
Confirms APA positions on accuracy calculation, examiner requirements, EPPA exemptions, and exam procedures. All opinions of deception or non-deception must be provided in writing, and results must be based solely on polygraph test data rather than behavioral observations [16]Verified Polygraph Frequently Asked Questions
Confirms APA positions on accuracy calculation, examiner requirements, EPPA exemptions, and exam procedures.
Polygraph Accuracy and Modern Technology
What the Research Shows
Polygraph accuracy is an area of active scientific discussion. The American Polygraph Association conducted an exhaustive meta-analysis completed in late 2011, reviewing all peer-reviewed publications on polygraph testing that met their Standards of Practice [26]Verified Polygraph Validity Research — Meta-Analytic Survey
Confirms APA meta-analysis found 87% decision accuracy across all validated techniques with 13% inconclusive rate. The analysis examined 38 studies involving 32 different samples and 45 experiments, with 295 scorers providing 11,737 scored results from 3,723 examinations [26]Verified Polygraph Validity Research — Meta-Analytic Survey
Confirms APA meta-analysis found 87% decision accuracy across all validated techniques with 13% inconclusive rate. The APA found that the combination of all validated polygraph techniques produced a decision accuracy of 87% with a 13% inconclusive rate [26]Verified Polygraph Validity Research — Meta-Analytic Survey
Confirms APA meta-analysis found 87% decision accuracy across all validated techniques with 13% inconclusive rate. Event-specific single-issue testing techniques achieved approximately 89% accuracy, while multiple-issue techniques achieved approximately 85% [27]Verified How Accurate Is The Polygraph Exam?
Confirms APA study found event-specific testing at 89% accuracy, multiple-issue at 85%, combined at 87%.
The American Psychological Association has noted this industry meta-analysis found an accuracy rate of 89%, while also observing that critics point out the research was not peer-reviewed by independent researchers [28]Verified Do 'lie detectors' work? What psychological science says about polygraphs
Confirms APA industry meta-analysis found 89% accuracy rate; NAS found CQT identified lies about 70% of the time. A landmark 2003 National Academy of Sciences report found that CQT polygraph testing could identify lies about 70% of the time [28]Verified Do 'lie detectors' work? What psychological science says about polygraphs
Confirms APA industry meta-analysis found 89% accuracy rate; NAS found CQT identified lies about 70% of the time, and concluded there was "little basis for the expectation that a polygraph test could have extremely high accuracy" [7]Verified The Polygraph and Lie Detection
Confirms NAS found polygraph has some utility for deterrence and security screening but with limited accuracy basis. A 2019 review by Iacono and Ben-Shakhar found that the quality of research has changed little since the NAS report, and that its conclusions still stand [29]Verified Current Status of Forensic Lie Detection With the CQT: An Update of the 2003 NAS Report
Confirms 2019 review found NAS report conclusions still stand and research quality has changed little. William George Iacono's comprehensive 50-year retrospective further reviewed the evolution of polygraph science and government promotion that has expanded polygraph use [30]Verified Psychology and the Lie Detector Industry: A Fifty-Year Perspective
Comprehensive 50-year retrospective on polygraph science reviewing CQT, CIT, and screening tests.
The National Research Council acknowledged that specific-incident polygraph tests perform above chance and have practical utility [7]Verified The Polygraph and Lie Detection
Confirms NAS found polygraph has some utility for deterrence and security screening but with limited accuracy basis, while noting that screening accuracy is generally lower [7]Verified The Polygraph and Lie Detection
Confirms NAS found polygraph has some utility for deterrence and security screening but with limited accuracy basis. For security firms, the key takeaway is that polygraph testing provides meaningful value as part of a layered security approach, particularly when conducted by qualified examiners following validated protocols.
Voice Stress Analysis vs. Polygraph
Some firms have explored voice stress analysis (VSA) as an alternative to traditional polygraph testing. However, the APA specifically states that instruments claiming to record voice stress are not polygraphs and have not been shown to work any better than chance [25]Verified Polygraph Frequently Asked Questions — Instruments
Confirms polygraph sensor attachments, procedures, and that voice stress analyzers are not polygraphs. Research by Harry Hollien found that commercial voice stress analyzer technologies, including the PSE, CVSA, and LVA systems, consistently performed at chance levels in detecting both deception and stress [31]Verified The Use of Voice in Security Evaluations
Confirms commercial voice stress analyzers performed at chance levels in detecting deception and stress. The scientific consensus strongly favors traditional polygraph instruments over voice-based alternatives.
Emerging technologies such as thermal imaging have shown promise. Research published in Nature demonstrated that periorbital thermal imaging could detect deception through facial blood flow changes [32]Verified Seeing Through the Face of Deception: Thermal Imaging for Mass Security Screening
Foundational research on thermal imaging as an alternative deception detection approach for security screening. Technologies like EyeDetect in Africa and emerging markets represent next-generation credibility assessment tools that may complement traditional polygraph in the future.
What Happens If a Security Employee Fails?
Employment Consequences
For security firms operating under the EPPA exemption, the consequences of a failed polygraph can be significant. Under the exemption described in subsections (e) and (f) of 29 U.S.C. § 2006, polygraph results may not be used as the sole basis for an adverse employment action — additional supporting evidence is required [33]Verified 29 U.S.C. § 2007(a)(2) — Exemption Limitations
Confirms that under security exemptions, polygraph results cannot be sole basis for adverse employment action. However, the threshold for additional evidence is lower than for EPPA-covered employers, and a failed polygraph combined with other concerns can justify termination.
Security firms typically treat polygraph results as one factor in employment decisions, combined with the examinee's explanations, investigation findings, and overall employment record. If criminal activity is confirmed through the polygraph process, results may be shared with law enforcement. Employees should be aware that results can only be disclosed to the employer who ordered the test, the employee who was tested, a court or government agency, or an arbitrator or mediator with a related court order [34]Verified State Laws on Polygraphs and Lie Detector Tests
Confirms EPPA enforced by DOL Wage and Hour Division and results disclosure restrictions.
The Inconclusive Result
An inconclusive result means the examiner was unable to render a definitive diagnosis of deception or truthfulness. The APA notes that in real-world settings, inconclusive results simply mean the examiner cannot render a definite diagnosis, and a second examination is usually conducted at a later date [25]Verified Polygraph Frequently Asked Questions — Instruments
Confirms polygraph sensor attachments, procedures, and that voice stress analyzers are not polygraphs. Those who use polygraph testing do not consider inconclusive results as negative outcomes and do not hold them against the examinee [25]Verified Polygraph Frequently Asked Questions — Instruments
Confirms polygraph sensor attachments, procedures, and that voice stress analyzers are not polygraphs.
This distinction is important in the accuracy debate: when the APA calculates accuracy excluding inconclusive results, they arrive at the 87% figure; when critics include inconclusive results as errors, accuracy appears lower, around 70% [25]Verified Polygraph Frequently Asked Questions — Instruments
Confirms polygraph sensor attachments, procedures, and that voice stress analyzers are not polygraphs. For security employees, an inconclusive result typically means re-testing rather than immediate adverse action.
Countermeasures: Can Security Employees Beat the Polygraph?
The Scientific Perspective on Countermeasures
The question of whether examinees can successfully defeat a polygraph test through countermeasures remains an area of scientific inquiry. The 2003 National Research Council report noted there is very limited evidence on whether countermeasure efforts can deceive experienced examiners [7]Verified The Polygraph and Lie Detection
Confirms NAS found polygraph has some utility for deterrence and security screening but with limited accuracy basis. The NRC acknowledged that countermeasures may be effective but the research base was insufficient for firm conclusions [7]Verified The Polygraph and Lie Detection
Confirms NAS found polygraph has some utility for deterrence and security screening but with limited accuracy basis.
Modern computerized polygraph systems incorporate algorithms designed to detect common countermeasure attempts, such as controlled breathing, muscle tensing, or mental arithmetic during control questions. Research on nonverbal deception detection programs has found that human ability to detect deceptive behavior generally performs at chance levels [35]Verified The Analysis of Nonverbal Communication: The Dangers of Pseudoscience in Security and Justice Contexts
Found that nonverbal deception detection programs lack scientific validity and perform at chance levels, which underscores why instrumented methods like polygraph remain valuable tools in security contexts despite their limitations. The research emphasizes that no single deception detection method is perfect, making layered approaches essential.
Pros
- EPPA exemption gives security firms broad legal authority to test candidates and current employees
- Powerful deterrent effect against criminal infiltration and insider threats in high-trust positions
- APA meta-analysis shows 87-89% decision accuracy for validated techniques across 38 qualifying studies
- Specific-incident testing performs well above chance for investigating security breaches and criminal activity
- Demonstrates due diligence to clients and insurers, strengthening the firm's reputation and legal position
- Periodic and random testing creates ongoing accountability that discourages misconduct between tests
- Well-established legal framework with clear procedures for implementation and employee rights
Cons
- Accuracy for screening purposes is lower than for specific-incident testing according to the NAS
- False positives can wrongly identify honest employees, potentially leading to unjust employment consequences
- Some states like Massachusetts broadly prohibit employer use of polygraphs, creating compliance complexity
- Pre-employment screening accuracy has limited research backing due to difficulty establishing ground truth
- Research shows asymmetric accuracy — one study found 94.9% for innocent examinees but only 43.2% for guilty
- Annual inflation-adjusted penalties for EPPA violations now significantly exceed the original $10,000 statutory amount
- Implementing a legally compliant program requires investment in qualified examiners and legal counsel
Frequently Asked Questions
Are security firms legally allowed to require polygraph tests?
Yes. Under Section 7(e) of the Employee Polygraph Protection Act (EPPA), codified at 29 U.S.C. § 2006(e), private employers whose primary business purpose consists of providing armored car personnel, security alarm system personnel, or other uniformed or plainclothes security personnel are exempt from the general prohibition on polygraph testing [15]Verified 29 CFR § 801.14 — Exemption for Employers Providing Security Services
Confirms Section 7(e) security services exemption details, 50% revenue threshold, and scope limitations. This means qualifying security firms can administer pre-employment polygraph tests as a condition of hiring and conduct ongoing testing of current employees. However, the exemption is limited to firms that derive at least 50% of their annual revenue from security services [15]Verified 29 CFR § 801.14 — Exemption for Employers Providing Security Services
Confirms Section 7(e) security services exemption details, 50% revenue threshold, and scope limitations, and the firm's function must include protection of specified facilities, materials, or proprietary information.
How accurate are polygraph tests used by security firms?
Accuracy depends on the type of test and methodology used. The APA's 2011 meta-analysis of 38 qualifying studies found an overall decision accuracy of 87% for validated techniques, with single-issue tests reaching approximately 89% and some techniques exceeding 90-92% [26]Verified Polygraph Validity Research — Meta-Analytic Survey
Confirms APA meta-analysis found 87% decision accuracy across all validated techniques with 13% inconclusive rate [27]Verified How Accurate Is The Polygraph Exam?
Confirms APA study found event-specific testing at 89% accuracy, multiple-issue at 85%, combined at 87%. However, the 2003 National Academy of Sciences report found that CQT polygraph testing identified lies about 70% of the time [28]Verified Do 'lie detectors' work? What psychological science says about polygraphs
Confirms APA industry meta-analysis found 89% accuracy rate; NAS found CQT identified lies about 70% of the time and noted the scientific basis was weak [7]Verified The Polygraph and Lie Detection
Confirms NAS found polygraph has some utility for deterrence and security screening but with limited accuracy basis. A 2019 review confirmed these NAS conclusions still stand [29]Verified Current Status of Forensic Lie Detection With the CQT: An Update of the 2003 NAS Report
Confirms 2019 review found NAS report conclusions still stand and research quality has changed little. Accuracy is generally higher for specific-incident testing than for screening purposes [7]Verified The Polygraph and Lie Detection
Confirms NAS found polygraph has some utility for deterrence and security screening but with limited accuracy basis. Security firms achieve the best results by using qualified examiners who follow APA Standards of Practice.
What happens if a security guard fails a polygraph test?
Under the EPPA security services exemption, polygraph results cannot be used as the sole basis for adverse employment action — additional supporting evidence is required [33]Verified 29 U.S.C. § 2007(a)(2) — Exemption Limitations
Confirms that under security exemptions, polygraph results cannot be sole basis for adverse employment action. However, a failed polygraph combined with other concerns can justify termination for EPPA-exempt security employers. Results may also be shared with law enforcement if criminal activity is suspected. Employees always retain the right to explain their responses, and firms should follow established procedures for handling failed results. An inconclusive result typically leads to re-testing rather than immediate termination.
Can a security employee refuse to take a polygraph test?
While employees technically have the right to refuse, the consequences differ significantly for EPPA-exempt security workers compared to other private employees. For security firms covered by the EPPA exemption, refusing a polygraph can be treated as grounds for non-hiring or termination, since the exemption specifically permits polygraph testing as a condition of employment [15]Verified 29 CFR § 801.14 — Exemption for Employers Providing Security Services
Confirms Section 7(e) security services exemption details, 50% revenue threshold, and scope limitations. However, the employee must be properly notified in advance and the testing must follow required procedural safeguards. For more on your rights, see our guide on whether you can refuse a lie detector test.
What types of questions are asked during a security industry polygraph?
Questions must be short, direct, closed-ended (yes/no), relevant to the examination purpose, and free from ambiguity. Pre-employment questions typically address criminal history, drug use, honesty on applications, and intentions for the position. Specific-incident questions focus on the event being investigated. Questions about race, religion, political beliefs, sexual orientation, or union membership are strictly prohibited under the EPPA [24]Verified 29 U.S.C. § 2007 — EPPA Rights of Examinees
Confirms examinee rights including right to terminate test and prohibition on discriminatory questions. The examinee reviews all questions before the examination begins.
Do state laws affect security firm polygraph testing?
Yes. While the EPPA provides the federal framework, Section 10 of the Act explicitly states it does not preempt more restrictive state laws [17]Verified 29 CFR Part 801 — Application of the EPPA of 1988
Confirms Section 10 of EPPA does not preempt more restrictive state or local laws. Massachusetts broadly prohibits employer use of lie detector tests under Chapter 149, Section 19B, with only a narrow law enforcement exception [18]Verified Massachusetts General Laws Chapter 149, Section 19B
Confirms Massachusetts broadly prohibits employer use of lie detector tests with limited law enforcement exception. Maryland similarly restricts employer-mandated polygraph testing under Section 3-702 of its General Employment Law [20]Verified Maryland General Employment Law Section 3-702
Confirms Maryland prohibits employers from requiring polygraph as condition of employment. Security firms operating in multiple states must comply with both federal and state law, which is why legal counsel is essential when developing a polygraph policy.
How long does a security firm polygraph exam take?
A complete polygraph examination typically takes 1.5 to 3 hours. Under EPPA requirements, no test may be less than 90 minutes in duration [16]Verified Polygraph Frequently Asked Questions
Confirms APA positions on accuracy calculation, examiner requirements, EPPA exemptions, and exam procedures. The process includes a pre-test interview (30-90 minutes) where questions are reviewed and sensors attached, the in-test phase where physiological responses are recorded, and a post-test phase where results are analyzed and communicated. Examiners are limited to no more than five tests per calendar day to ensure quality [16]Verified Polygraph Frequently Asked Questions
Confirms APA positions on accuracy calculation, examiner requirements, EPPA exemptions, and exam procedures.
What penalties do employers face for EPPA violations?
The original EPPA statute established a civil penalty of $10,000 per violation [13]Verified 29 U.S.C. § 2005(a)(1) — EPPA Penalties
Confirms original EPPA statutory penalty was $10,000 per violation. Due to annual inflation adjustments required by the Federal Civil Penalties Inflation Adjustment Act, this amount has increased significantly. The penalty was raised to $19,787 in 2016 [14]Verified Department of Labor Federal Civil Penalties Inflation Adjustment Act Catch-Up Adjustments
Confirms EPPA penalty increased from $10,000 to $19,787 in 2016 inflation adjustment, and subsequent annual adjustments have continued to increase it. Beyond monetary penalties, the Secretary of Labor can seek injunctive relief, and employees may file private civil actions seeking reinstatement, back pay, and benefits [12]Verified Employee Polygraph Protection Act — U.S. Department of Labor
Confirms EPPA is enforced by the Wage and Hour Division of the DOL. Even EPPA-exempt security firms must follow procedural safeguards or face penalties.
Where can I book a lie detector test near me?
Sources & References
Confirms U.S. security services market reached $47.8 billion in 2023
Confirms approximately 1.2 million security guards employed in the U.S. in 2023
Demonstrated measurable physiological responses during security clearance-relevant questioning
Confirms guard and patrol services segment generates $36.6 billion in annual revenue
Confirms insider threat costs averaging $17.4 million annually per organization based on Ponemon Institute data
Confirms 76% of organizations detected increased insider threat activity over five years
Confirms NAS found polygraph has some utility for deterrence and security screening but with limited accuracy basis
Confirms over 85% of Fortune 500 companies use third-party security services
Identifies critical disconnect between polygraph industry's foundational understanding and practical priorities
Confirms EPPA of 1988 generally prevents employers from using polygraph tests with certain exemptions
Confirms EPPA enacted December 27, 1988 with $10,000 statutory penalty per violation
Confirms EPPA is enforced by the Wage and Hour Division of the DOL
Confirms original EPPA statutory penalty was $10,000 per violation
Confirms EPPA penalty increased from $10,000 to $19,787 in 2016 inflation adjustment
Confirms Section 7(e) security services exemption details, 50% revenue threshold, and scope limitations
Confirms APA positions on accuracy calculation, examiner requirements, EPPA exemptions, and exam procedures
Confirms Section 10 of EPPA does not preempt more restrictive state or local laws
Confirms Massachusetts broadly prohibits employer use of lie detector tests with limited law enforcement exception
Confirms Massachusetts SJC ruled polygraph tests inadmissible due to unproven reliability
Confirms Maryland prohibits employers from requiring polygraph as condition of employment
Found 94.9% accuracy for innocent examinees but only 43.2% for guilty in security screening
Examines statistical implications of repeated polygraph testing on same personnel in security contexts
Confirms examinee rights including right to terminate test and prohibition on discriminatory questions
Confirms polygraph sensor attachments, procedures, and that voice stress analyzers are not polygraphs
Confirms APA meta-analysis found 87% decision accuracy across all validated techniques with 13% inconclusive rate
Confirms APA study found event-specific testing at 89% accuracy, multiple-issue at 85%, combined at 87%
Confirms APA industry meta-analysis found 89% accuracy rate; NAS found CQT identified lies about 70% of the time
Confirms 2019 review found NAS report conclusions still stand and research quality has changed little
Comprehensive 50-year retrospective on polygraph science reviewing CQT, CIT, and screening tests
Confirms commercial voice stress analyzers performed at chance levels in detecting deception and stress
Foundational research on thermal imaging as an alternative deception detection approach for security screening
Confirms that under security exemptions, polygraph results cannot be sole basis for adverse employment action
Confirms EPPA enforced by DOL Wage and Hour Division and results disclosure restrictions
Found that nonverbal deception detection programs lack scientific validity and perform at chance levels
Concluded specific-incident tests perform above chance but screening accuracy is insufficient for federal security use
If your firm needs to verify staff integrity or investigate an internal incident, arrange a corporate polygraph service with a professional examiner.