Waiting for Polygraph Results: Timeline, Process & Tips

Workplace Investigations and Theft

One of the most common scenarios leading to polygraph testing is a workplace investigation. When discrepancies appear in financial records — mismatched cash flow statements, inventory shortages, or unexplained expenses — an employer may suspect internal theft and request polygraph testing for the department.

This scenario is more common than many realize. According to the Association of Certified Fraud Examiners (ACFE), organizations lose an estimated 5% of annual revenue to occupational fraud [1]Verified Occupational Fraud 2024: A Report to the Nations
Confirms organizations lose an estimated 5% of annual revenue to occupational fraud, based on analysis of 1,921 cases across 138 countries. The ACFE's 2024 Report to the Nations analyzed 1,921 actual fraud cases across 138 countries, finding a median loss of $145,000 per incident [1]Verified Occupational Fraud 2024: A Report to the Nations
Confirms organizations lose an estimated 5% of annual revenue to occupational fraud, based on analysis of 1,921 cases across 138 countries. When employers suspect internal theft causing economic harm, workplace polygraph testing serves as a valuable investigative tool.

Under the Employee Polygraph Protection Act of 1988 (EPPA), private-sector employers are generally prohibited from requiring polygraph tests [2]Verified Employee Polygraph Protection Act of 1988 (EPPA) — 29 CFR Part 801
Confirms EPPA prohibits most private employers from using lie detector tests, with government employers exempt; effective December 27, 1988. However, critical exceptions exist. When a company has experienced a specific economic loss — such as theft, embezzlement, or sabotage — and has reasonable suspicion that particular employees had access and opportunity, the employer may request polygraph examinations [3]Verified Employee Polygraph Protection Act (EPPA) Summary
Confirms employers cannot discharge, discipline, or discriminate based solely on polygraph results without additional supporting evidence. The employer must also provide a written statement identifying the loss, its nature, and the basis for reasonable suspicion [4]Verified EPPA Checklist and Guidelines
Confirms employer must provide written statement identifying loss, access, and reasonable suspicion; $10,000 penalty per violation.

It is essential to understand that even under these exceptions, an employer cannot compel you to take a lie detector test. Refusing is your legal right, and the EPPA prohibits termination or disciplinary action solely for declining to participate [2]Verified Employee Polygraph Protection Act of 1988 (EPPA) — 29 CFR Part 801
Confirms EPPA prohibits most private employers from using lie detector tests, with government employers exempt; effective December 27, 1988. Learn more about what happens if you lie on a polygraph test or what to expect if you fail a theft polygraph.

Pre-Employment Screening

Federal, state, and local law enforcement agencies — including the FBI, CIA, Customs and Border Protection (CBP), and the Secret Service — routinely require polygraph testing as part of their hiring process [5]Verified Pre-Employment Polygraph Screening in Law Enforcement
Confirms law enforcement agencies routinely require polygraph testing as part of hiring process. These government agencies are exempt from EPPA restrictions [2]Verified Employee Polygraph Protection Act of 1988 (EPPA) — 29 CFR Part 801
Confirms EPPA prohibits most private employers from using lie detector tests, with government employers exempt; effective December 27, 1988. For candidates in these pipelines, the waiting period can be especially stressful because their entire career trajectory may hinge on the outcome.

CBP's own FAQ states that pre-employment investigative screening, including the polygraph, background investigation, and security adjudication, can take up to 12 months or longer [6]Verified CBP Careers — Frequently Asked Questions
Confirms pre-employment investigative screening including polygraph can take up to 12 months or longer. The stakes feel impossibly high, and the timeline for pre-employment polygraph results is often significantly longer than workplace investigations. Read our 8 tips for success with employment polygraph tests to prepare effectively.

Legal, Relationship, and Private Testing

People also undergo polygraph testing in legal proceedings, such as post-conviction sex offender testing (PCSOT), probation compliance checks, and criminal defense strategies. Private lie detector tests are also commonly used for infidelity investigations, clearing false accusations, and resolving family disputes. For insight into whether polygraph results are admissible in court, see our legal guide. Each of these scenarios carries its own unique emotional burden during the waiting period.

Pre-Test Phase (30–60 Minutes)

The pre-test is typically the longest segment of a polygraph examination [7]Verified Polygraph Frequently Asked Questions
Confirms three-phase examination process, question formats, chart collection standards, and result disclosure rules. During this phase, the examiner explains the testing process, reviews the questions that will be asked, discusses the reason for the examination, and establishes a baseline for your physiological responses.

The examiner attaches several sensors to your body: corrugated rubber pneumograph tubes around your chest and abdomen to measure respiration (thoracic and abdominal patterns recorded separately), a blood pressure cuff (cardio-sphygmomanometer) on your arm, galvanic skin response sensors on your fingers to detect electrodermal activity, and typically a motion-sensing seat activity sensor [8]Verified APA Standards of Practice (Adopted August 23, 2019)
Confirms standard result categories (DI, NDI, INC), instrumentation requirements including thoracic/abdominal pneumographs and seat activity sensor. For a full explanation of this instrumentation, see our guide on how a polygraph works.

Critically, the examiner reviews every test question with you in advance — there are no surprises. This is a fundamental aspect of proper polygraph protocol.

In-Test Phase (30–45 Minutes)

During the actual testing phase, the examiner asks the agreed-upon questions while the polygraph instrument records your physiological responses. The examiner typically runs multiple charts — each chart is a complete pass through the question set, and a minimum of three charts is standard practice [9]Verified How Many Chart Runs Does a Polygraph Require?
Confirms minimum of three charts is standard practice for polygraph examinations. Learn more about how many chart runs a polygraph requires.

Questions alternate between relevant questions (directly related to the issue under investigation), comparison questions (designed to create a known baseline response), and irrelevant questions (neutral questions like 'Is today Wednesday?'). The comparison question format was first validated in field research by Charles Robert Honts and David C. Raskin in their landmark 1988 study, which established the directed-lie comparison question as at least as accurate as the probable-lie format with fewer false positive errors [10]Verified A Field Study of the Validity of the Directed Lie Control Question
First field validation of directed-lie comparison question, showing DLC at least as accurate as probable-lie CQT with fewer false positive errors. A video camera usually records the session for quality assurance and later review.

Post-Test Phase (15–30 Minutes)

After the charts are collected, the examiner removes the sensors and may conduct a brief post-test interview. If significant physiological reactions were observed to certain questions, the examiner may offer you an opportunity to explain or elaborate. This phase is where admissions sometimes occur — not through coercion, but because some examinees choose to disclose additional information after experiencing the physiological monitoring process.

Research by Mark Handler and Charles Robert Honts has demonstrated that the traditional fight-or-flight paradigm is inadequate as the sole explanation for polygraph responses, with multiple factors including cognitive arousal, emotional responses, and behavioral conditioning all playing roles [11]Verified You Can't Run, But You Can Hide: A Critical Look at the Fight or Flight Response in Psychophysiological Detection of Deception
Demonstrates fight-or-flight paradigm is inadequate as sole explanatory mechanism for polygraph responses; multiple factors including cognitive arousal play roles. The post-test interview is recorded and becomes part of the examination file.

Chart Analysis and Scoring

Once you leave the exam room, the examiner's work is far from over. The polygraph instrument has collected extensive physiological data — typically three to five complete charts, each containing simultaneous recordings of breathing patterns, cardiovascular activity, electrodermal response (skin conductance), and countermeasure detection data.

The examiner must analyze each chart independently, comparing your physiological reactions to relevant questions against your reactions to comparison questions. Modern polygraph examiners use one of several validated scoring systems. The Empirical Scoring System (ESS) is an evidence-based numerical scoring model for manual test data analysis of comparison question test formats [12]Verified Empirical Scoring System (ESS) Definition
Confirms ESS is an evidence-based numerical scoring model for manual TDA of comparison question test formats, including normative data and cut scores. ESS includes physiological data features correlated with truth and deception, mathematical transformation methods for assigning numerical scores, decision rules for classification, and cut scores based on normative data that allow calculation of the probability of an erroneous result [12]Verified Empirical Scoring System (ESS) Definition
Confirms ESS is an evidence-based numerical scoring model for manual TDA of comparison question test formats, including normative data and cut scores.

Examiners also frequently use or cross-reference computerized scoring algorithms. The Objective Scoring System, version 3 (OSS-3), developed by Raymond Nelson, Mark Handler, and Donald Krapohl, is one of the most widely validated computer scoring models [13]Verified Brute-Force Comparison: A Monte Carlo Study of OSS-3 and Human Polygraph Scorers
Confirms OSS-3 scoring algorithm developed by Nelson, Handler, and Krapohl; demonstrates balanced sensitivity and specificity. Developed originally at the U.S. Department of Defense Polygraph Institute, OSS-3 uses a logistic regression formula trained on large datasets of confirmed truth and deception outcomes, outputting a probability score calibrated to empirical accuracy thresholds [14]Verified Modern Algorithms in Polygraph Data Analysis
Confirms OSS-3 developed at DoDPI using logistic regression; PolyScore uses linear discriminant analysis and Bayesian probability; ESS-M is multinomial variant. Other computerized algorithms include PolyScore, which uses linear discriminant analysis and Bayesian probability [14]Verified Modern Algorithms in Polygraph Data Analysis
Confirms OSS-3 developed at DoDPI using logistic regression; PolyScore uses linear discriminant analysis and Bayesian probability; ESS-M is multinomial variant, and ESS-M, a multinomial version of ESS [15]Verified Guide for How to Use the ESS-Multinomial Reference Tables
Confirms ESS-M multinomial reference tables allow Bayesian analysis of posterior probability of deception or truth-telling. Learn more about numerical scoring in polygraph testing.

Neither manual nor computerized scoring is instantaneous; both require careful attention to detail and professional judgment.

Video Review

The examiner reviews the complete video recording of the session, noting behavioral observations relevant to chart interpretation. Were you physically still during the charts, or did you shift position? Were there any observable countermeasure attempts? Did your verbal and non-verbal behavior during the post-test interview align with the chart data? This contextual review helps ensure the accuracy of the final determination.

Report Compilation

Once the data is scored and video reviewed, the examiner writes a formal report. This document typically includes the purpose of the examination, a summary of the pre-test interview, the questions asked, the charts collected, the scoring methodology used, the numerical scores obtained, and the examiner's final opinion — expressed as one of three outcomes: No Deception Indicated (NDI), Deception Indicated (DI), or Inconclusive (INC) [8]Verified APA Standards of Practice (Adopted August 23, 2019)
Confirms standard result categories (DI, NDI, INC), instrumentation requirements including thoracic/abdominal pneumographs and seat activity sensor.

In workplace investigation contexts, the examiner often has multiple employees to test. If an entire department is being polygraphed, the examiner may conduct several exams in a single day or over multiple days. Each exam requires its own independent analysis and report, extending the timeline before results are delivered.

Quality Assurance

Reputable polygraph practices incorporate quality assurance steps. The American Polygraph Association (APA) adopted a Model Policy for Quality Assurance in 2017, outlining procedures including self-review, internal review by another examiner, external review by an independent examiner, or blind review in which the reviewer is not informed of the examiner's conclusion [16]Verified APA Model Policy for Quality Assurance (Approved July 20, 2017)
Confirms quality assurance review types: self-review, internal review, external review, and blind review; reviewers should not reverse examiner conclusions without gross error. The APA has also established a Standard of Practice requiring the use of a computer scoring algorithm for evidentiary polygraph examinations [17]Verified APA Board Reports — Standards of Practice Update
Confirms APA adopted Standard of Practice requiring computer scoring algorithm for evidentiary polygraph examinations.

According to the APA's Standards and Principles of Practice, polygraph results can only be released to authorized persons — the examinee, anyone designated in writing by the examinee, the requesting party, and others as required by law [18]Verified APA Standards and Principles of Practice — Results Disclosure
Confirms polygraph results can only be released to authorized persons: examinee, designated persons, requesting party, and as required by law. These safeguards protect both the examinee and the requesting party, but they add time to the delivery process.

Typical Timelines by Context

The timeline depends heavily on the context of your examination:

Workplace Investigations: Typically 24–72 hours. The examiner completes all testing, returns to their office, analyzes data, compiles reports, and delivers findings to the employer. Multiple examinees may extend this to a full business week.

Law Enforcement Pre-Employment: 1–4 weeks is common; some federal agencies such as the CIA, FBI, and NSA may take 4–8 weeks or longer due to security protocols, additional background investigation phases, and bureaucratic processing. CBP states that the entire pre-employment screening process, including polygraph, can take up to 12 months [6]Verified CBP Careers — Frequently Asked Questions
Confirms pre-employment investigative screening including polygraph can take up to 12 months or longer.

Private Lie Detector Tests: 24–48 hours is typical. Private examiners often provide faster turnaround because they handle fewer cases simultaneously and the requesting party is the direct client.

Legal / Court-Ordered: Variable — 48 hours to several weeks depending on attorney schedules, court deadlines, and whether results require additional review before disclosure.

For those exploring different types of testing, our guides on multi-issue polygraph tests and counterintelligence vs. full-scope polygraphs explain how test complexity affects processing time.

Why You Don't Get Immediate Results

Many people expect to receive their polygraph results immediately after the examination. This expectation is understandable but unrealistic. Polygraph data involves complex physiological recordings that require professional interpretation, numerical scoring using validated algorithms, and written documentation.

The APA's 2011 meta-analytic survey of criterion accuracy, encompassing 38 studies, 3,723 examinations, and 11,737 scored results, demonstrated that event-specific diagnostic tests achieve an aggregated decision accuracy of 89% (confidence interval 83%–95%) [19]Verified Meta-Analytic Survey of Criterion Accuracy of Validated Polygraph Techniques
38 studies, 3,723 examinations, 11,737 scored results: event-specific 89% accuracy (CI 83–95%), multi-issue 85% (CI 77–93%), combined 87% (CI 80–94%). Multi-issue screening tests produced 85% accuracy (confidence interval 77%–93%) [19]Verified Meta-Analytic Survey of Criterion Accuracy of Validated Polygraph Techniques
38 studies, 3,723 examinations, 11,737 scored results: event-specific 89% accuracy (CI 83–95%), multi-issue 85% (CI 77–93%), combined 87% (CI 80–94%). Achieving these accuracy levels requires rigorous post-exam analysis — rushing the process increases the risk of errors that could devastate careers, relationships, or legal cases.

Research also shows that cognitive processing alone generates detectable physiological responses — mental arithmetic tasks produce observable electrodermal activity that increases with problem difficulty [20]Verified Tests with Numbers
Demonstrates mental arithmetic tasks produce observable EDA responses that increase with cognitive difficulty, showing cognitive processing alone generates detectable physiological reactions. This illustrates the sophistication of the data examiners must interpret and why careful post-exam analysis is essential.

Key Variables in Your Wait Time

Number of Examinees: When an employer tests an entire department, the examiner must complete and analyze every examination before delivering any results. An examiner can typically conduct 2–4 full examinations per day, so testing a department of 10 people may span multiple days of testing followed by several days of analysis.

Complexity of the Issue: A straightforward single-issue examination (e.g., 'Did you steal from the cash register?') generates simpler data than a multi-faceted investigation covering drug use, financial impropriety, unauthorized disclosures, and personal integrity. Research confirms that single-issue test formats produce higher diagnostic accuracy than multi-issue formats [19]Verified Meta-Analytic Survey of Criterion Accuracy of Validated Polygraph Techniques
38 studies, 3,723 examinations, 11,737 scored results: event-specific 89% accuracy (CI 83–95%), multi-issue 85% (CI 77–93%), combined 87% (CI 80–94%). The more issues covered, the more data to analyze.

Quality Assurance Requirements: Some agencies and firms require blind chart review by a second qualified examiner. Federal agencies often have mandatory QA protocols that add days or weeks to the process [16]Verified APA Model Policy for Quality Assurance (Approved July 20, 2017)
Confirms quality assurance review types: self-review, internal review, external review, and blind review; reviewers should not reverse examiner conclusions without gross error.

Examiner Workload: A busy examiner conducting multiple tests per week may have a backlog of analyses. Some examiners work independently while others are part of larger firms with scheduled review workflows.

Administrative and Legal Protocols: In legal contexts, results may need attorney review, formal submission through legal channels, or coordination with court schedules. In probation or parole settings, results may be routed through multiple supervisors.

Inconclusive Results Requiring Retesting: If your initial examination produces an inconclusive result — meaning the data does not clearly support either a deceptive or non-deceptive finding — the examiner or requesting party may schedule a retest. This effectively doubles your waiting time. For more on this scenario, see our guide on retaking a polygraph after an inconclusive result.

Why the Wait Feels Unbearable

Research in psychology reveals that uncertainty is more stressful than known negative outcomes. A 2016 study published in Nature Communications by researchers at University College London found that people experienced greater stress when they had a 50% chance of receiving an electric shock than when they were certain to receive one [21]Verified Computations of Uncertainty Mediate Acute Stress Responses in Humans
Confirms 50% uncertainty about receiving electric shock was more stressful than 100% certainty; published in Nature Communications 2016. Lead author Archy de Berker explained that "it's much worse not knowing you are going to get a shock than knowing you definitely will or won't" [21]Verified Computations of Uncertainty Mediate Acute Stress Responses in Humans
Confirms 50% uncertainty about receiving electric shock was more stressful than 100% certainty; published in Nature Communications 2016.

This paradox — that not knowing is worse than knowing bad news — explains why waiting for polygraph results feels so agonizing. Your brain is engaged in what psychologists call perseverative cognition — repetitive, worry-focused thinking about a future outcome you cannot control. You replay the exam in your head: Did the examiner notice something? Did my nervousness create a false reading? Was my breathing irregular on that one question? This mental replay loop activates the hypothalamic-pituitary-adrenal (HPA) axis, producing cortisol, adrenaline, and the full cascade of stress symptoms.

The Truthful Examinee's Paradox

Something many people do not realize is that truthful examinees often experience more anxiety during the waiting period than those who actually committed the act under investigation. Guilty individuals have already had time to process their actions and may have mentally prepared for consequences. Innocent people, however, face the possibility that the test could produce a false result — that they could be wrongly accused despite telling the truth.

Research on the theoretical mechanisms underlying comparison question test effectiveness helps explain this dynamic. Heinz Offe and S. Offe (2007) provided experimental evidence for the psychological processes driving CQT accuracy, demonstrating that comparison questions serve to calibrate physiological responses in a way that distinguishes between deceptive and truthful examinees [22]Verified The Comparison Question Test: Does It Work and If So How?
Investigated theoretical mechanisms underlying CQT effectiveness; provided experimental evidence for psychological processes driving CQT accuracy. Understanding this science can be reassuring — the test is designed with these psychological dynamics in mind.

The pioneering field validity work of Philip J. Bersh (1969) found 92% agreement between polygraph results and an independent panel of attorneys' verdicts, demonstrating the instrument's ability to align with established ground truth [23]Verified A Validation Study of Polygraph Examiner Judgments
Found 92% agreement between polygraph results and independent panel of attorneys' verdicts; pioneering field validity study. For those concerned about how anxiety might affect their results, understanding the distinction between test-related nervousness and deceptive responses is key.

Catastrophic Thinking Patterns

During the waiting period, most people engage in catastrophizing — imagining the worst possible outcome and treating it as the most likely scenario. You envision being fired, losing your career, or facing public humiliation. These catastrophic thoughts feel real and convincing when you are in the grip of waiting-period anxiety, but they almost always overestimate both the probability and severity of negative outcomes.

Notably, the Aldrich Ames case and the Jonathan Pollard case demonstrate that even the polygraph system itself is not infallible — which means the process includes human judgment and context, not just machine output. Your examiner is a trained professional who considers the full picture.

1. Anchor Yourself in Facts

Remind yourself of the objective data. If you told the truth during the examination, the statistical likelihood is that the results will reflect that. The APA's comprehensive meta-analysis found that event-specific polygraph tests achieve 89% accuracy, with a confidence interval ranging from 83% to 95% [19]Verified Meta-Analytic Survey of Criterion Accuracy of Validated Polygraph Techniques
38 studies, 3,723 examinations, 11,737 scored results: event-specific 89% accuracy (CI 83–95%), multi-issue 85% (CI 77–93%), combined 87% (CI 80–94%). The early field validation work by Philip J. Bersh (1969) found 92% agreement between polygraph results and independent panel verdicts [23]Verified A Validation Study of Polygraph Examiner Judgments
Found 92% agreement between polygraph results and independent panel of attorneys' verdicts; pioneering field validity study. If you were truthful, the data is working in your favor.

Repeating factual statements to yourself — 'I told the truth, and the data reflects truth' — is a cognitive-behavioral technique called cognitive restructuring that directly counters catastrophic thinking.

2. Practice the 4-7-8 Breathing Technique

Physiological anxiety responds well to controlled breathing exercises. The 4-7-8 breathing method, popularized by integrative medicine specialist Dr. Andrew Weil, is based on the ancient yogic practice of pranayama [24]Verified 4-7-8 Breathing Control: Effects on Heart Rate Variability and Blood Pressure
Confirms 4-7-8 breathing developed by Dr. Andrew Weil, based on pranayama; reduces oxygen consumption, heart rate, and blood pressure; increases parasympathetic tone. The technique is simple: inhale through your nose for 4 counts, hold for 7 counts, and exhale slowly through your mouth for 8 counts.

Research confirms that this pattern activates the parasympathetic nervous system — the 'rest and digest' system — which directly counteracts the fight-or-flight response [24]Verified 4-7-8 Breathing Control: Effects on Heart Rate Variability and Blood Pressure
Confirms 4-7-8 breathing developed by Dr. Andrew Weil, based on pranayama; reduces oxygen consumption, heart rate, and blood pressure; increases parasympathetic tone. Short-term slow breathing has been shown to reduce oxygen consumption, heart rate, and blood pressure while increasing parasympathetic tone [24]Verified 4-7-8 Breathing Control: Effects on Heart Rate Variability and Blood Pressure
Confirms 4-7-8 breathing developed by Dr. Andrew Weil, based on pranayama; reduces oxygen consumption, heart rate, and blood pressure; increases parasympathetic tone. Practice this whenever anxiety spikes — it takes under 60 seconds and can be done anywhere.

3. Engage in Physical Activity

Exercise is one of the most powerful immediate anxiety reducers available. A brisk 30-minute walk, a run, a gym session, or even vigorous housework burns off excess adrenaline and cortisol while triggering endorphin release. The physiological benefits are immediate and well-documented. Even a single session of moderate physical activity can noticeably reduce anxiety levels for several hours afterward.

4. Understand the Process

Knowledge reduces uncertainty, and uncertainty is the primary driver of waiting-period stress [21]Verified Computations of Uncertainty Mediate Acute Stress Responses in Humans
Confirms 50% uncertainty about receiving electric shock was more stressful than 100% certainty; published in Nature Communications 2016. By reading this guide and understanding exactly what the examiner is doing with your data — analyzing charts, running scoring algorithms, reviewing video, writing a formal report — you remove the mystery and reduce the unknown. The process is systematic, evidence-based, and designed to produce accurate results.

5. Limit Reassurance-Seeking Behavior

Resist the urge to repeatedly search the internet for polygraph horror stories or ask friends and family what they think your results will be. This behavior provides momentary relief but ultimately feeds the anxiety cycle. Set specific times — perhaps once per day — when you allow yourself to think about the test, and redirect your attention at all other times.

6. Talk to a Trusted Person

Social support is one of the most effective stress buffers known to psychology. Share your feelings with a trusted friend, family member, therapist, or counselor. Simply verbalizing your anxiety can reduce its intensity. If your polygraph was related to a workplace investigation, be mindful of confidentiality — but you can still discuss your feelings without revealing details.

7. Maintain Your Routine

Anxiety thrives on disruption. Continue going to work, exercising, eating regular meals, and maintaining your sleep schedule. Structure and routine provide a sense of normalcy and control that directly counteracts the helplessness that waiting-period anxiety creates. Avoid alcohol and excessive caffeine, both of which can worsen anxiety symptoms.

EPPA Protections

The Employee Polygraph Protection Act of 1988 (EPPA) provides significant protections for employees in the private sector [2]Verified Employee Polygraph Protection Act of 1988 (EPPA) — 29 CFR Part 801
Confirms EPPA prohibits most private employers from using lie detector tests, with government employers exempt; effective December 27, 1988. Key provisions include:

Most private employers are prohibited from requiring, requesting, or suggesting that employees or prospective employees take lie detector tests [2]Verified Employee Polygraph Protection Act of 1988 (EPPA) — 29 CFR Part 801
Confirms EPPA prohibits most private employers from using lie detector tests, with government employers exempt; effective December 27, 1988. Employers cannot discharge, discipline, or discriminate against anyone for refusing to take a test [2]Verified Employee Polygraph Protection Act of 1988 (EPPA) — 29 CFR Part 801
Confirms EPPA prohibits most private employers from using lie detector tests, with government employers exempt; effective December 27, 1988. Even when polygraph testing is permitted under EPPA exceptions (specific economic loss, reasonable suspicion), the employer cannot take adverse action based solely on polygraph results without additional supporting evidence [3]Verified Employee Polygraph Protection Act (EPPA) Summary
Confirms employers cannot discharge, discipline, or discriminate based solely on polygraph results without additional supporting evidence. Polygraph results can only be disclosed to authorized persons — the examinee, anyone designated by the examinee in writing, and the requesting party [18]Verified APA Standards and Principles of Practice — Results Disclosure
Confirms polygraph results can only be released to authorized persons: examinee, designated persons, requesting party, and as required by law.

Government employers — federal, state, and local — are exempt from EPPA [2]Verified Employee Polygraph Protection Act of 1988 (EPPA) — 29 CFR Part 801
Confirms EPPA prohibits most private employers from using lie detector tests, with government employers exempt; effective December 27, 1988. Certain private-sector employers are also exempt, including security service firms (armored car, alarm, guard companies) and pharmaceutical manufacturers, distributors, and dispensers [3]Verified Employee Polygraph Protection Act (EPPA) Summary
Confirms employers cannot discharge, discipline, or discriminate based solely on polygraph results without additional supporting evidence. Violations carry penalties of up to $10,000 per violation [4]Verified EPPA Checklist and Guidelines
Confirms employer must provide written statement identifying loss, access, and reasonable suspicion; $10,000 penalty per violation.

State-Level Protections

In addition to EPPA, many states have their own polygraph laws, some of which are more restrictive than the federal standard [3]Verified Employee Polygraph Protection Act (EPPA) Summary
Confirms employers cannot discharge, discipline, or discriminate based solely on polygraph results without additional supporting evidence. EPPA does not preempt state or local laws that prohibit lie detector tests or provide greater protections [3]Verified Employee Polygraph Protection Act (EPPA) Summary
Confirms employers cannot discharge, discipline, or discriminate based solely on polygraph results without additional supporting evidence. No state prohibits polygraph testing in all settings [18]Verified APA Standards and Principles of Practice — Results Disclosure
Confirms polygraph results can only be released to authorized persons: examinee, designated persons, requesting party, and as required by law, but several impose sweeping bans on pre-employment polygraphs in the private sector.

The Three Result Categories

When you receive your polygraph results, the examiner's opinion will be expressed using one of three standard classifications [8]Verified APA Standards of Practice (Adopted August 23, 2019)
Confirms standard result categories (DI, NDI, INC), instrumentation requirements including thoracic/abdominal pneumographs and seat activity sensor:

No Deception Indicated (NDI): The physiological data suggests that you were truthful in your responses to the relevant questions. This is the outcome truthful examinees should expect. Learn more in our complete guide to NDI results.

Deception Indicated (DI): The physiological data suggests that deceptive responses were detected to one or more relevant questions. This does not necessarily mean the examiner is 100% certain of deception — it means the data, when scored using validated methods, crossed the threshold for a deceptive classification.

Inconclusive (INC): The data does not clearly support either a deceptive or non-deceptive finding. This can happen for many reasons, including heightened anxiety, physical discomfort, or simply physiological responses that fall near the decision threshold. An inconclusive result is not a failure — it means more information is needed. A retest may be offered.

It is worth noting that emerging technologies like EyeDetect and other polygraph alternatives are being developed alongside traditional polygraph methods, though the standard polygraph examination remains the most widely used credibility assessment tool globally.