Increasing numbers of people seeking polygraph examinations identify as neurodivergent. These individuals present with a wide range of profiles, including attention deficit hyperactivity disorder (ADHD), autism spectrum conditions, dyslexia, dyspraxia, dyscalculia, Tourette syndrome and other neurodevelopmental presentations. Many arrive having already navigated complex legal, clinical or employment-related circumstances, and they frequently carry one very direct question with them: “Can I actually undergo a polygraph examination?”
The short answer is that neurodiversity alone does not prevent someone from undergoing a professionally conducted polygraph examination. The more complete answer, however, is that good practice requires a thorough individual assessment rather than a sweeping assumption in either direction. An experienced examiner does not apply blanket exclusions, nor do they assume that any particular profile automatically makes someone an ideal candidate. What matters is understanding how an individual’s communication style, cognitive processing and sensory profile may influence the examination process, and responding to those considerations with professional rigour.
This article is written for solicitors, barristers, family courts, employers, investigators, therapists, psychologists, police and potential examinees. It is also written for neurodivergent individuals and their families who deserve a clear, honest and evidence-based account of what to expect.
Why Neurodiversity Matters During a Polygraph Examination
A polygraph examination is a structured psychological and physiological procedure. It is not a simple question-and-answer session. A professionally conducted examination involves detailed pre-test interviewing, the obtaining of informed consent, careful question formulation, sustained concentration over an extended period, continuous physiological recording and a structured post-test discussion.
Each of these stages places demands on areas of cognitive functioning that may be affected by neurodevelopmental differences. Executive functioning, which encompasses planning, sustained attention, impulse regulation and cognitive flexibility, influences how an individual navigates both the pre-test interview and the test phase itself. Working memory affects how well an examinee processes and retains spoken questions in real time. Processing speed influences how quickly they formulate and deliver responses. Sensory processing differences may influence how distracting or distressing the physical environment proves to be.
Recognising these factors does not reduce the scientific integrity of the examination. On the contrary, failing to account for them introduces a greater risk of procedurally compromised or unfair results. Evidence-based practice requires that examiners understand the individual before them, not merely the diagnosis on a referral letter.
What Does the Polygraph Actually Measure?
A common source of anxiety among neurodivergent individuals, and among the professionals supporting them, is a misunderstanding of what the polygraph records. It is worth being unambiguous on this point.
Professional polygraph examinations do not measure autism, ADHD, anxiety disorders, personality characteristics or behavioural traits. They do not identify neurodivergence, and they are not designed to do so. What the polygraph records are physiological responses. Specifically, the instrumentation monitors three primary channels:
- Respiration — rate and depth of breathing, recorded via sensors positioned around the chest and abdomen
- Electrodermal activity — changes in skin conductance associated with sweat gland activity, recorded from the fingertips
- Cardiovascular activity — blood pressure, pulse rate and amplitude, recorded via a cuff on the upper arm
These physiological channels are recorded continuously while the examinee answers a carefully constructed series of questions. Professional interpretation then considers the patterning of responses across the entire examination rather than any single isolated reaction. It is a process grounded in psychophysiology rather than in behavioural observation.
It is equally important to emphasise what professional examiners do not do. They do not assess truthfulness based on eye contact, body language, fidgeting, facial expressions or other observable behaviours. The proposition that deception can be reliably detected through behavioural observation alone is not supported by the scientific literature, and such approaches have no place in competent polygraph practice.
Neurodiversity Is Not Deception
This distinction deserves its own section, because the consequences of conflating neurodivergent characteristics with indicators of deception are serious.
Many characteristics associated with neurodivergence can easily be misread by those without appropriate training or awareness. Reduced or atypical eye contact is common among autistic individuals and those with certain anxiety presentations, yet it carries no independent evidential weight regarding truthfulness. Fidgeting and motor restlessness are frequently associated with ADHD. Slow or delayed responses may reflect processing differences rather than uncertainty or evasion. Literal interpretation of questions is a well-documented feature of many autistic presentations, and it can cause genuine confusion when questions contain ambiguity, figurative language or implied meaning.
Further examples include monotone or flat speech patterns, difficulty with open-ended questions, sensory overload leading to apparent withdrawal or agitation, and elevated baseline anxiety that is intrinsic to the individual’s profile rather than reactive to a specific question. High anxiety is also common in individuals presenting with co-occurring presentations such as generalised anxiety disorder, which frequently accompanies neurodevelopmental profiles.
When considered in isolation, none of these characteristics constitute reliable indicators of deception. An examiner who treats them as such is operating outside responsible professional practice. A pre-test interview conducted by a skilled, informed examiner should identify these features and contextualise them appropriately before any testing begins.
Informed Consent and Capacity to Consent
Informed consent is a foundational ethical requirement of any professionally conducted polygraph examination. For neurodivergent individuals, the process of obtaining genuine informed consent warrants particular care.
Consent is only meaningful if the individual understands what they are agreeing to. This requires that they comprehend the purpose of the examination, the nature of the physiological recording process, how the results will be used and by whom, their right to withdraw at any point, and the limitations of the procedure. For individuals with significant cognitive processing differences, intellectual disabilities, or communication difficulties, a signed consent form alone does not demonstrate that genuine understanding has been achieved.
Responsible practice requires the examiner to assess comprehension actively rather than passively. This may involve explaining the process in stages, inviting the examinee to paraphrase what they have understood, using plain language or visual aids where appropriate, and allowing additional time for questions. Where there is genuine doubt about an individual’s capacity to provide informed consent, the examination should not proceed. Independent legal advice or clinical consultation may be appropriate in such cases.
For examinees who are subject to statutory or quasi-statutory polygraph testing, such as those on post-conviction sexual offence programmes, the question of voluntary participation and meaningful consent carries additional legal and ethical complexity that should be considered carefully on the facts of each case.
The Importance of the Pre-Test Interview
The pre-test interview is arguably the most consequential phase of the entire examination. It is during this phase that the examiner gathers the information necessary to assess suitability, establish rapport, obtain informed consent and collaboratively construct and review the examination questions. For neurodivergent individuals, the pre-test interview carries particular significance.
A thorough pre-test interview with a neurodivergent examinee should encompass:
- Medical and developmental history, including any formal diagnoses and the age at which they were received
- Current medication, including type, dosage and timing relative to the examination appointment
- Communication preferences, including whether the examinee is more comfortable with written rather than verbal information, whether they require additional time to process questions and whether they find certain conversational conventions challenging
- Previous diagnostic assessments, which may help the examiner understand the specific profile of the individual rather than relying on diagnostic labels alone
- Sensory sensitivities, including responses to noise, lighting, temperature and physical contact where this is relevant to the attachment of instrumentation
- Executive functioning and working memory, particularly as these relate to the ability to sustain attention during the test phase and to hold question content in mind whilst formulating a response
- Need for additional explanation, including whether standard question wording will require modification or clarification
- Need for rest breaks, which may be appropriate where sustained concentration is particularly demanding
- Ability to understand each question as presented, which must be confirmed before testing begins
If, following the pre-test interview, the examiner has unresolved concerns about an individual’s capacity to provide valid responses, they may determine that postponing the examination or pursuing an alternative approach is more appropriate. Proceeding with an examination when genuine suitability concerns have not been resolved does not serve the interests of justice, the examinee or the referring party.
The Centre for Forensic Neuroscience offers a pre-examination screening process to assist in gathering relevant background information ahead of any appointment.
Communication Support and Intermediaries
Where an individual’s communication needs are significant, the use of a communication supporter or registered intermediary may be appropriate. Registered intermediaries are trained specialists, recognised within the criminal justice system in England and Wales, who assist individuals with communication difficulties to participate fairly in legal proceedings. Whilst their role is most established in the context of police interviewing and court proceedings, the underlying principle — that communication support should be provided where it is needed for fair participation — applies with equal logic to forensic assessment settings.
For individuals who use British Sign Language (BSL) or another signed language as their primary means of communication, a qualified interpreter should be engaged. For those who use augmentative and alternative communication (AAC) systems, the examiner should familiarise themselves with the individual’s method of communication before the pre-test interview begins. Compatibility between AAC use and the physiological recording process should be considered at the planning stage.
The involvement of any third party in the examination setting, whether as a communication supporter or interpreter, should be managed carefully. The examiner should ensure that the third party’s role is clearly defined and does not influence the examination itself. The presence of a support person during the pre-test phase does not necessarily extend to the test phase, and this should be discussed and agreed in advance.
Reasonable Adjustments
The concept of reasonable adjustments is familiar from employment and education contexts, but its underlying rationale applies with equal force to forensic assessment. The British Psychological Society’s guidance on neurodiversity in the workplace and on the assessment of individuals with neurodevelopmental differences (2024) addresses psychometric testing rather than polygraph examinations specifically. However, the BPS principles are directly relevant: assessment procedures should be reviewed to ensure they do not disadvantage individuals with neurodevelopmental differences in ways that are unrelated to the attribute being measured. Applied to the polygraph context, this means that procedural accommodations should be made wherever doing so improves the accuracy and fairness of the assessment, without altering what is being measured or how results are interpreted.
Reasonable adjustments in a polygraph context may include:
- Additional time during the pre-test interview and question review phase
- Clear, structured explanations of each stage of the process before it begins
- Written information provided in advance of the appointment, so that the examinee can familiarise themselves with the procedure at their own pace
- Practice or familiarisation materials to reduce anticipatory anxiety about unfamiliar equipment or procedures
- Reduced distractions in the examination environment, including minimising background noise and avoiding interruptions
- Comfortable lighting adjusted where possible to avoid sensory discomfort
- Appropriate room temperature, which can become a source of significant distraction for individuals with sensory sensitivities
- Plain, straightforward language throughout, avoiding idioms, ambiguous phrasing and jargon
- Checking understanding at each stage, rather than assuming comprehension
- Allowing clarification of any question before the test phase begins
- Communication support or interpretation, where the individual’s communication needs require it
These adjustments do not provide any unfair advantage in terms of examination outcomes. They ensure that the examination measures what it is intended to measure, rather than inadvertently measuring the impact of an inaccessible process on a neurodivergent individual.
Question Formulation
Question formulation is one of the most technically demanding aspects of polygraph practice, and its importance is amplified when examining neurodivergent individuals. The polygraph question formulation process at the Centre for Forensic Neuroscience adheres to established principles that align closely with the accommodations required by many neurodivergent examinees.
Effective question formulation for neurodivergent individuals involves:
- Single-issue questions: Each question should address one issue only. Multiple concepts within a single question create processing demands that may compromise the validity of a response.
- Simple sentence structure: Short, active sentences reduce the cognitive load associated with parsing complex grammar.
- Avoiding double negatives: Questions phrased as “Did you never…” or “Is it untrue that you didn’t…” create ambiguity that is particularly problematic for literal processors.
- Avoiding assumptions: Questions that presuppose facts not yet established can confuse examinees who process language precisely.
- Avoiding figurative language: Idioms and metaphors should be excluded.
- Avoiding vague wording: Terms such as “recently,” “sometimes” or “inappropriately” may mean different things to different people, and this ambiguity should be resolved before testing.
- Avoiding multiple embedded concepts: Even where questions are formally simple, they may carry implicit assumptions that need to be made explicit.
These principles are already regarded as good polygraph practice for every examinee, regardless of neurodevelopmental profile. In this sense, the adjustments required for neurodivergent individuals represent best practice more broadly, rather than exceptional concessions.
Working Memory and Executive Functioning
Reduced working memory capacity can make lengthy or syntactically complex questions difficult to hold in mind whilst simultaneously formulating a response. This is not a reflection of honesty or the lack of it; it is a feature of how certain cognitive profiles process information under time pressure.
In practical terms, this means examiners should ensure that each relevant question is fully understood, and that the examinee has had the opportunity to ask for clarification, before the recording phase begins. Question review is standard practice in professional examinations, but the depth and care with which it is conducted may need to be extended for individuals with working memory difficulties.
Executive functioning differences, including difficulties with impulse control or cognitive flexibility, are similarly relevant. An examinee who responds before fully processing a question, or who becomes cognitively overwhelmed by an unexpected question format, may produce physiological responses that do not validly reflect their psychological state in relation to the question asked. Identifying and accommodating these possibilities in advance is part of responsible practice.
Sensory Considerations
The physical environment of a polygraph examination can present particular challenges for individuals with sensory sensitivities. Standard examination rooms are not always designed with sensory comfort in mind, and this can introduce confounding variables that affect both the examinee’s wellbeing and the quality of physiological data collected.
Relevant environmental considerations include background noise levels, including sounds from outside the room that may be distracting or distressing; lighting intensity and type, since certain fluorescent or flickering lighting can cause significant discomfort for some individuals; room temperature; and the presence of other people nearby, which may affect comfort.
The polygraph instrumentation itself involves physical contact: respiratory sensors are attached around the chest and abdomen, electrodermal sensors are placed on the fingers and a cardiovascular cuff is positioned on the arm. For individuals with heightened tactile sensitivity, the attachment of instrumentation should be explained carefully and carried out in a way that minimises discomfort. Establishing the examinee’s comfort with each component before the test begins is both good practice and a basic courtesy.
Reducing unnecessary distractions benefits all examinees, not only those who identify as neurodivergent. For those with sensory sensitivities, however, it may be the difference between a valid examination and an unusable one.
Medication
Medication is a relevant consideration for many neurodivergent examinees, particularly those with ADHD who are prescribed stimulant or non-stimulant pharmacological treatments.
Medications commonly used in the management of ADHD include methylphenidate (sold under brand names such as Ritalin and Concerta), lisdexamfetamine (Vyvanse) and atomoxetine (Strattera). Each of these agents has cardiovascular and autonomic effects that are potentially relevant to the physiological channels recorded during a polygraph examination. Stimulant medications, for example, may elevate resting heart rate and blood pressure and could affect electrodermal responsivity, though the direction and magnitude of such effects vary between individuals. The timing of doses relative to the examination appointment may therefore be a consideration, to be weighed carefully on the facts of each case.
It is important to be clear that the diagnosis itself is not the determining factor. Rather, the examiner must consider the individual’s medication, its known pharmacological profile, the timing of the most recent dose and any other relevant health factors before determining whether to proceed. This requires a degree of pharmacological awareness that forms part of the professional competencies expected of a trained forensic examiner.
This article does not constitute medical advice, and decisions regarding medication should always be made in consultation with the prescribing clinician. Examinees are encouraged to disclose all current medications during the pre-test interview.
The Equality Act 2010
Several neurodevelopmental presentations are capable of meeting the definition of a disability under the Equality Act 2010. To qualify, an impairment must have a substantial and long-term adverse effect on the ability to carry out normal day-to-day activities. Many autistic individuals and those with ADHD may meet this threshold, though not all will, and the assessment is always individual.
Where the Equality Act applies, those providing services are required to make reasonable adjustments to ensure that disabled individuals are not placed at a substantial disadvantage compared with those who are not disabled. In the context of forensic assessment services, this principle supports the reasonable adjustments described in this article.
This is not merely a legal obligation. It reflects a broader commitment to fairness that is entirely consistent with the scientific and ethical principles underpinning professional forensic practice. Evidence-based practice and equitable practice are not in tension with one another; they are mutually reinforcing.
This article does not constitute legal advice. Those seeking advice about their specific rights under the Equality Act should consult a qualified solicitor.
Neurodiversity and the Concealed Information Test
The Concealed Information Test (CIT), sometimes referred to as the Guilty Knowledge Test, operates on a different psychophysiological rationale to comparison question techniques. Rather than comparing responses to relevant and comparison questions, the CIT presents a series of alternative stimuli — one of which holds significance for the examinee — and detects differential orienting responses to the known item. This paradigm has features that may be particularly relevant when examining neurodivergent individuals.
Because the CIT does not require the examinee to formulate verbal responses to emotionally charged questions in the same way as comparison question procedures, some of the concerns about question comprehension and literal interpretation may be less pronounced. However, the CIT is not inherently less demanding for neurodivergent examinees. Individuals with attention difficulties may show variable orienting responses. Those with alexithymia — difficulty identifying or describing internal emotional states, which is reported at higher prevalence in autistic populations — may present with attenuated electrodermal responding generally, which could affect the sensitivity of the test. These are considerations that require individual assessment rather than categorical conclusions.
The choice between examination methodologies should form part of the pre-examination suitability review. In some cases the CIT may represent a more appropriate option for a given individual; in others it may not. No single procedure is universally preferable across all neurodivergent profiles.
Neurodiversity and Statement Verification
Statement analysis and statement verification techniques are sometimes used alongside or instead of physiological polygraph methods in investigative contexts. These approaches examine the linguistic content and structure of verbal or written accounts rather than physiological responses.
For neurodivergent individuals, statement analysis raises its own considerations. Autistic individuals, for example, may produce statements that differ from neurotypical expectations in ways that are related to communication style rather than veracity. Features such as atypical narrative structure, highly detailed technical accounts, reduced emotional language, or unusual patterns of hedging and qualification may be misinterpreted by those unfamiliar with neurodivergent communication. Competent statement analysis in these cases requires the analyst to be informed about the individual’s communication profile before drawing interpretive conclusions.
Similarly, for those with dyslexia or other written language difficulties, written statement analysis may not be the most appropriate methodology. The examiner should consider whether the analysis is measuring what it purports to measure, or whether it is partly measuring the linguistic effects of a communication difference.
Common Misconceptions
Myth: Autistic people cannot take a polygraph examination.
Fact: Autism does not automatically prevent someone from undergoing a professionally conducted examination. Suitability is assessed individually, taking into account the specific profile, communication needs and circumstances of the person concerned. Many autistic individuals undergo polygraph examinations without difficulty when appropriate support and adjustments are in place.
Myth: ADHD makes polygraph results unreliable.
Fact: Suitability depends upon the individual rather than the diagnosis alone. ADHD encompasses a wide range of presentations, and the presence of an ADHD diagnosis does not preclude a valid examination. Where relevant, medication, symptom profile, pre-test preparation and environmental adjustments are considered before testing begins.
Myth: Reasonable adjustments reduce scientific validity.
Fact: Appropriate adjustments improve fairness and help ensure that examinees fully understand the examination process. They do not alter the physiological measurement process itself. On the contrary, failing to make appropriate adjustments risks producing data that reflects the demands of an inaccessible process rather than the examinee’s genuine responses to the questions posed.
Myth: Neurodivergent individuals are harder to test because they are more likely to produce false results.
Fact: There is currently no robust published evidence that neurodivergence, as a broad category, is systematically associated with higher rates of false positive or false negative results in professionally conducted examinations. The more significant determinants of result quality are individual factors including pre-test preparation, question formulation and examiner competency.
Illustrative Examples
The following examples are presented for illustrative purposes only. They do not represent real cases or real individuals.
Example 1 — Autistic Examinee
A referral is received from a family law solicitor in relation to an adult with a formal autism diagnosis. The examiner conducts an extended pre-test interview, during which it becomes clear that the individual processes questions very literally and becomes confused by any phrasing that implies rather than states a fact. The examination questions are simplified and reviewed collaboratively until the examinee can confirm that each one is fully understood. The examiner also confirms, at each stage of the consent process, that the individual genuinely understands what they are agreeing to. The room is arranged to minimise background noise, and the instrumentation is attached incrementally, with the examiner explaining each stage before proceeding. The examination proceeds without difficulty.
Example 2 — ADHD Examinee
An individual with a combined-type ADHD diagnosis presents for examination as part of a workplace investigation. During the pre-test interview, it is apparent that they are struggling to retain question content across the full review sequence, and they require frequent pauses. The examiner extends the pre-test phase, revisits each question individually and allows additional clarification time. Short scheduled breaks are incorporated into the pre-test review. The examinee reports that they feel fully prepared before the test phase begins. The examination proceeds and yields interpretable data.
Example 3 — Dyslexic Examinee
An examinee with dyslexia is referred for examination in connection with an insurance fraud investigation. In advance of the appointment, the examiner provides a written summary of the examination procedure in plain English, using a sans-serif font and wide line spacing. The examinee reviews this at home and arrives with specific questions already prepared. The pre-test interview is conducted verbally, with the examiner confirming comprehension at each stage. No written materials are required during the test phase itself, which the examinee had been advised of in advance.
Professional Standards
Professional polygraph examiners are bound by standards that require individual assessment, scientific neutrality, ethical conduct and evidence-based practice. The American Psychological Association’s guidance on psychological testing with diverse populations, the ASTM standards governing polygraph instrumentation and procedure, and the British Psychological Society’s frameworks for the fair assessment of individuals with diverse profiles all converge on a common principle: that assessment must be adapted to the individual rather than the individual being expected to conform to an inflexible procedure.
Scientific neutrality in this context means that the examiner’s role is to conduct a fair and accurate assessment, not to produce an outcome that serves any particular referring party. This principle applies with particular force when examining individuals whose cognitive or sensory profile may interact with the examination process in ways that are not fully predictable in advance.
Ethical practice requires that examiners do not proceed with an examination where they have unresolved concerns about suitability. Where doubt exists, postponement, additional clinical consultation or the use of an alternative assessment methodology may be the more responsible course of action. The right to decline to proceed is as important as the competence to proceed well.
Accommodations, when appropriate, should never compromise the integrity of the examination. Their purpose is to remove unnecessary barriers, not to alter the fundamental nature of what is being assessed. A question that is simplified so that it is understood is not a different question; it is the same question rendered accessible.
Further information about the approach taken at the Centre for Forensic Neuroscience is available from Dr Keith Ashcroft, and through the Centre’s Polygraph Examinations and Concealed Information Test (CIT) pages.
Conclusion
Neurodiversity should never be viewed as an automatic barrier to polygraph examinations, nor should it be treated as irrelevant to how an examination is planned, conducted and interpreted. Experienced examiners recognise that individual differences exist across all examinees, and that neurodevelopmental profiles represent a specific and increasingly common dimension of that individual variation.
What competent, ethical forensic practice requires is not a fixed response to a diagnostic label, but a thorough suitability assessment conducted before testing begins, careful attention to informed consent, an adaptable and informed approach to the pre-test interview, careful attention to question formulation and a willingness to implement reasonable adjustments where they are needed. The Equality Act 2010 provides one legal framework for these obligations, but the underlying principles are those of fairness, scientific rigour and professional responsibility.
Evidence-based practice does not proceed from assumption. It proceeds from assessment. When neurodivergent individuals present for polygraph examination, they deserve the same quality of professional attention as any other examinee: careful, individualised and grounded in the best available evidence.
Dr Keith Ashcroft is a Chartered Psychologist, Chartered Scientist, and forensic polygraph examiner at the Centre for Forensic Neuroscience. The Centre provides professionally conducted polygraph examinations, Concealed Information Tests and statement analysis for legal, corporate and private clients across the UK. If you have questions about neurodiversity and polygraph suitability, please contact us to discuss your requirements in confidence.
Disclaimer: The information contained in this article is provided for general informational and educational purposes only. Suitability for any polygraph examination is determined on an individual basis following a comprehensive professional assessment conducted by a qualified examiner. Nothing in this article should be interpreted as medical advice, legal advice or clinical guidance. Readers seeking advice on medical matters, including medication adjustments, should consult their treating clinician. Readers seeking advice on legal matters, including their rights under the Equality Act 2010, should consult a qualified solicitor. The Centre for Forensic Neuroscience accepts no liability for decisions made on the basis of this article alone.