Missouri Law Enforcement Polygraph: Highway Patrol Guide

Trooper Selection Process Overview

The Missouri State Highway Patrol (MSHP) maintains one of the most thorough law enforcement hiring processes in the country, and the polygraph examination is a central component. The Trooper Selection Process includes a written examination (NCJOSI2), a physical fitness assessment, polygraph examination, background investigation, oral interview board, medical examination, drug screening, and a psychological examination [1]Verified Missouri State Highway Patrol Trooper Selection Process
Confirms polygraph is a mandatory phase of the MSHP Trooper Selection Process, covering employment history, financial history, drug usage, criminal convictions, and basic honesty. Every applicant must successfully complete each phase to be considered for employment [1]Verified Missouri State Highway Patrol Trooper Selection Process
Confirms polygraph is a mandatory phase of the MSHP Trooper Selection Process, covering employment history, financial history, drug usage, criminal convictions, and basic honesty.

The polygraph examination is administered by a Patrol polygraphist and is designed to assist the background investigator in conducting a comprehensive investigation of each applicant [2]Verified MSHP Trooper Selection Process Pre-Employment Testing Document
Confirms polygraph is administered by a Patrol polygraphist and that applicants must sign a waiver prior to testing. The areas covered during the Highway Patrol polygraph include employment history, traffic record, financial history, past and current illegal drug usage, record of criminal convictions, and basic honesty [3]Verified MSHP Commercial Vehicle Officer Career Bulletin
Confirms polygraph topics for CVO applicants and that employment is contingent upon successful polygraph completion. This multi-topic approach ensures that the Patrol identifies candidates with the highest integrity levels.

Applicants for trooper positions must be at least 21 years of age, a U.S. citizen and Missouri resident, and possess at least 30 credit hours of college coursework or two years of active military duty or certified peace officer experience [4]Verified Missouri State Highway Patrol Requirements
Confirms trooper age, education requirements, and 25-week academy training in Jefferson City. Those who successfully pass all selection phases attend 25 weeks of recruit training at the Missouri State Highway Patrol Law Enforcement Academy in Jefferson City [4]Verified Missouri State Highway Patrol Requirements
Confirms trooper age, education requirements, and 25-week academy training in Jefferson City. A national survey of large U.S. police agencies found that approximately 62% utilized pre-employment polygraph screening, rejecting about 25% of applicants based on information not uncovered through other screening methods [5]Verified A national survey of practices, policies and evaluative comments on the use of pre-employment polygraph screening in police agencies in the United States
Confirms 62% of large U.S. police agencies use pre-employment polygraph, rejecting approximately 25% of applicants based on polygraph-derived information. Missouri's Highway Patrol exemplifies this best practice. For more details on polygraph testing or to book a polygraph test, visit our dedicated pages.

Commercial Vehicle Officer Polygraph

The MSHP also requires polygraph testing for Commercial Vehicle Officer (CVO) positions. Employment with the Missouri State Highway Patrol in these roles is contingent upon undergoing and successfully completing a polygraph examination, background investigation, psychological evaluation, a medical examination, and a Patrol-administered drug test [6]Verified MSHP Commercial Vehicle Enforcement Division Career Opportunity Bulletin (2024)
Confirms polygraph, background investigation, psychological evaluation, medical exam, and drug test required for all MSHP CVO positions. The CVO selection process mirrors the trooper process closely, including a written examination, oral interview board, polygraph examination, background investigation, medical examination, psychological examination, and drug screening [7]Verified MSHP Commercial Vehicle Officer Selection Process
Confirms the multi-phase CVO selection process including polygraph examination.

The polygraph for CVO applicants covers the same six key areas as the trooper exam: employment history, traffic record, financial history, past and current illegal drug usage, record of criminal convictions, and basic honesty [3]Verified MSHP Commercial Vehicle Officer Career Bulletin
Confirms polygraph topics for CVO applicants and that employment is contingent upon successful polygraph completion. Applicants must possess a Missouri Class A POST license or meet the requirements to obtain one [8]Verified MSHP CVO Posting – Class A POST License Requirement
Confirms Missouri Class A POST license requirement for CVO positions. The development of the Directed Lie Screening Test (DLST), which achieves 98% accuracy for innocent examinees in laboratory studies, has strengthened the scientific foundation behind screening programs like these [9]Verified A focused polygraph technique for PCSOT and law enforcement screening programs
Confirms DLST derived from TES research achieves 98% accuracy for innocent and 83.3% for guilty examinees in laboratory studies.

Medical Considerations and Accommodations

The Missouri State Highway Patrol acknowledges that certain conditions such as hypertension, pregnancy, respiratory or heart ailments may affect polygraph results [2]Verified MSHP Trooper Selection Process Pre-Employment Testing Document
Confirms polygraph is administered by a Patrol polygraphist and that applicants must sign a waiver prior to testing. However, the Patrol notes that there is no medical evidence that a polygraph examination affects a person's health [2]Verified MSHP Trooper Selection Process Pre-Employment Testing Document
Confirms polygraph is administered by a Patrol polygraphist and that applicants must sign a waiver prior to testing. Applicants are encouraged to discuss the polygraph step with their physician prior to the exam. Those who are pregnant will not be tested until after the birth of the child [2]Verified MSHP Trooper Selection Process Pre-Employment Testing Document
Confirms polygraph is administered by a Patrol polygraphist and that applicants must sign a waiver prior to testing. If an accommodation is needed, the applicant must discuss this with the Human Resources Division at the time the examination is scheduled [2]Verified MSHP Trooper Selection Process Pre-Employment Testing Document
Confirms polygraph is administered by a Patrol polygraphist and that applicants must sign a waiver prior to testing. All applicants must sign a waiver form prior to taking the polygraph [2]Verified MSHP Trooper Selection Process Pre-Employment Testing Document
Confirms polygraph is administered by a Patrol polygraphist and that applicants must sign a waiver prior to testing.

Kansas City Police Department (KCPD)

The Kansas City Missouri Police Department — the largest police agency in the region, serving over 465,000 residents across approximately 319 square miles [10]Verified Kansas City Police Department Officer Requirements
Confirms KCPD serves over 465,000 people across 319 square miles and requires pre-employment polygraph — requires polygraph examinations for both sworn and non-sworn positions. Qualified applicants proceed to the polygraph examination, which is administered by a qualified Polygraph Examiner and covers criminal activity, drug usage, integrity, truthfulness, and employment history [11]Verified Kansas City Police Department Hiring Process – Step By Step
Confirms KCPD polygraph covers criminal activity, drug usage, integrity, truthfulness, and employment history for sworn and non-sworn positions.

KCPD's hiring process includes a written entrance exam, physical abilities test, pre-employment polygraph examination, background investigation, a ride-along experience, an oral board interview, and psychological and medical examinations [12]Verified How to Become a Police Officer in Kansas City
Confirms KCPD hiring process includes polygraph, background investigation, ride-along, oral interview, and academy training. Applicants must be at least 20½ years old at the time of application, a U.S. citizen, and must establish residency within 30 air miles of Kansas City [13]Verified Kansas City Missouri Police Department – National Testing Network
Confirms age, citizenship, residency, and POST certification requirements for KCPD. The American Polygraph Association provides national standards that support programs like KCPD's screening protocol.

St. Louis County Police Department

The St. Louis County Police Department, one of the most respected departments in the state with over 1,000 employees [14]Verified St. Louis County Police Department Recruitment
Confirms St. Louis County PD has over 1,000 employees and uses polygraph to conclude background investigation, also requires pre-employment polygraph testing. Applicants submit requested documents, interview with a Background Detective, and complete a polygraph interview as part of the background investigation phase [15]Verified Join St. Louis County Police Department – Apply Now
Confirms applicants complete a polygraph interview as part of the background investigation phase. The background investigation is concluded with a polygraph examination in an attempt to verify information received from and about the applicant, and results are confidential and considered with the applicant's total file [16]Verified St. Louis County Police Department – Police Officer Job Posting
Confirms polygraph results are confidential and considered with applicant's total file.

St. Louis County PD holds particular significance in Missouri's polygraph landscape because St. Louis County is the only jurisdiction in Missouri that requires a local polygraph examiner license [17]Verified APA State Licensing Boards & Associations – Missouri
Confirms Missouri requires polygraph license in St. Louis County only; no license required elsewhere in the state. This unique local licensing requirement means examiners operating within St. Louis County must be credentialed through the St. Louis County Police Department at 7900 Forsyth Blvd., Clayton, MO 63105 [17]Verified APA State Licensing Boards & Associations – Missouri
Confirms Missouri requires polygraph license in St. Louis County only; no license required elsewhere in the state. Learn more about this requirement in our Missouri Polygraph Licensing: St. Louis County Requirement guide.

Springfield Police Department

The Springfield Police Department, serving the southwest Missouri area, includes the polygraph as a mandatory post-offer step in its hiring process. After a conditional job offer is made, final steps include a drug test, medical exam, psychological evaluation, and polygraph before the job offer is confirmed [18]Verified Springfield Police Department – Police Recruit Hiring
Confirms Springfield PD requires polygraph as post-offer step before job offer is confirmed. Springfield PD has its own SPD Polygraph Technician who prepares questions for each candidate's polygraph examination based on the applicant's background investigation packet [19]Verified Springfield Police Department Standard Operating Guideline – Selection Process
Confirms Springfield PD Polygraph Technician prepares questions based on background investigation packet.

Springfield PD requires applicants to be a high school graduate, a U.S. citizen, and to possess either a Class A POST certification, military service with honorable discharge, or equivalent qualifications [20]Verified Become an Officer – Springfield Police Department
Confirms Springfield PD hiring includes polygraph, minimum qualifications, and that SPD runs its own academy. The department runs its own academy and is recognized across the region for training excellence [20]Verified Become an Officer – Springfield Police Department
Confirms Springfield PD hiring includes polygraph, minimum qualifications, and that SPD runs its own academy.

Jefferson City and Other Municipal Agencies

The City of Jefferson, Missouri's capital, also requires polygraph testing as part of its police officer hiring process. The examination process for a Police Officer in Jefferson City includes a written exam, physical efficiency battery test, background check, personal interview, polygraph, drug screen, medical exam, and psychological exam [21]Verified City of Jefferson Employment Testing – Police Officer Process
Confirms Jefferson City requires polygraph as part of the police officer examination process. Numerous other Missouri municipalities — including the City of St. Charles, Riverside, and suburban departments around Kansas City and St. Louis — similarly require pre-employment polygraph examinations for law enforcement candidates [22]Verified Riverside, MO Police Department Recruitment
Confirms Riverside PD hiring includes background check, polygraph, psychological examination, and drug testing.

The Missouri Polygraph Association (MPA) plays a vital role in maintaining professional standards across the state. MPA quarterly business meetings are held at the Missouri State Highway Patrol Troopers Association Building in Jefferson City, and the membership includes a large number of MSHP troopers as well as current and former law enforcement officers from throughout Missouri [23]Verified Missouri Polygraph Association
Confirms MPA meetings at MSHP Troopers Association Building, membership standards, and background investigation requirement for members. If you're looking for a lie detector test in Missouri, our network can connect you with qualified examiners.

State Licensing: The St. Louis County Exception

Missouri's approach to polygraph examiner licensing is notably unique. Unlike states such as Texas, which maintains a comprehensive statewide licensing system, Missouri has no statewide polygraph examiner licensing requirement. The only jurisdiction requiring a license is St. Louis County [17]Verified APA State Licensing Boards & Associations – Missouri
Confirms Missouri requires polygraph license in St. Louis County only; no license required elsewhere in the state. This means that outside of St. Louis County, polygraph examiners in Missouri operate without a state-mandated license, though professional certification through organizations like the American Polygraph Association and the American Association of Police Polygraphists (AAPP) remains the industry standard.

The St. Louis County licensing program is administered through the Professional Licensing section of the St. Louis County Police Department [24]Verified St. Louis County Professional Licensing Manual
Confirms polygraph examiner licensing requirements in St. Louis County, administered by St. Louis County Police Department. Any polygraph examiner working in St. Louis County or St. Louis City must hold a Metropolitan license issued by either the St. Louis Metropolitan Police or St. Louis County Police Department [24]Verified St. Louis County Professional Licensing Manual
Confirms polygraph examiner licensing requirements in St. Louis County, administered by St. Louis County Police Department. This localized requirement provides an additional layer of credibility and oversight in Missouri's largest metropolitan area.

Professional Standards and the Missouri Polygraph Association

Although Missouri lacks comprehensive statewide licensing, the Missouri Polygraph Association (MPA) fills an important gap by maintaining rigorous membership standards. All MPA applicants are subject to extensive background investigations and must be voted in for membership regardless of whether they are sworn law enforcement, military, or private examiners [25]Verified Missouri Polygraph Association – Membership Standards
Confirms MPA members must pass background investigation and meet strict continuing education requirements from state and national associations. MPA examiners are certified not only by their basic polygraph academy but also by both state and national polygraph associations through strict continuing education requirements [25]Verified Missouri Polygraph Association – Membership Standards
Confirms MPA members must pass background investigation and meet strict continuing education requirements from state and national associations.

For those interested in pursuing a career as a polygraph examiner in Missouri, APA-accredited training programs provide the foundation. Options include programs at Marston Polygraph Academy in California, PEAK Credibility Assessment Training in Florida, the American International Institute of Polygraph in Georgia, and the National Center for Credibility Assessment at Fort Jackson. To explore all available training, visit our Polygraph Training page or learn how to become a polygraph examiner.

Missouri POST Commission and Peace Officer Training

While the Missouri POST (Peace Officer Standards and Training) Commission does not directly regulate polygraph examiners, it plays a critical role in the law enforcement ecosystem that relies on polygraph screening. The POST Commission, established in 1988, is responsible for licensing peace officers, ensuring compliance with continuing education requirements, and investigating peace officer license discipline under Chapter 590, RSMo [26]Verified Missouri Department of Public Safety – Peace Officer Standards and Training
Confirms POST Commission responsibility for licensing peace officers and approving training curricula under Chapter 590, RSMo. The POST Program also licenses basic training centers and approves law enforcement training curricula [26]Verified Missouri Department of Public Safety – Peace Officer Standards and Training
Confirms POST Commission responsibility for licensing peace officers and approving training curricula under Chapter 590, RSMo.

Missouri has 21 licensed basic training centers across the state, operated by law enforcement organizations, higher education institutions, and professional associations [27]Verified FAQ: POST Certification – Missouri Cities Review
Confirms Missouri has 21 licensed basic training centers across the state. Peace officers must complete 24 hours of Continuing Law Enforcement Education (CLEE) annually [28]Verified Missouri DPS – 2025 Continuing Law Enforcement Education Requirements
Confirms Missouri peace officers must obtain 24 hours of annual continuing education. To be certified, applicants must be at least 21 years of age, a U.S. citizen, a Missouri resident, and hold at least a high school diploma or equivalent [29]Verified Missouri Administrative Rules – Peace Officer Certification Requirements
Confirms peace officer certification requires U.S. citizenship, Missouri residency, age 21, and high school diploma. Understanding the POST framework is valuable context for any candidate preparing for the polygraph phase of Missouri law enforcement hiring.

State v. Biddle (1980): Missouri's Polygraph Evidence Ruling

The landmark Missouri Supreme Court decision in State v. Biddle (1980) established that polygraph examination results are inadmissible in Missouri criminal trials. In Biddle, the Missouri Supreme Court held that evidence of polygraph examinations is inadmissible in a criminal trial, even when both parties have stipulated to their admission [30]Verified State v. Biddle, 599 S.W.2d 182 (Mo. banc 1980)
Confirms Missouri Supreme Court held polygraph evidence inadmissible in criminal trials in State v. Biddle (1980). The case involved Thomas Woodrow Biddle, who was convicted of first degree robbery; the court reversed the conviction, finding the polygraph test results were inadmissible and the remaining circumstantial evidence was insufficient [31]Verified State v. Burch, 939 S.W.2d 525 (Mo. App. 1997) – Citing Biddle
Confirms Biddle reversed conviction for first degree robbery finding polygraph results inadmissible.

Prior to Biddle, Missouri courts had allowed stipulated polygraph results into evidence under certain conditions [32]Verified State v. Walker, 616 S.W.2d 48 (Mo. banc 1981)
Confirms Biddle applied prospectively; prior to Biddle, stipulated polygraph results could be admitted into evidence. The Biddle decision fundamentally changed Missouri's evidentiary rules regarding polygraph evidence. A subsequent case, State v. Walker (1981), confirmed that Biddle's holding would be applied prospectively, meaning it did not retroactively affect prior convictions involving stipulated polygraph evidence [33]Verified Missouri Supreme Court Brief – State ex rel. Kemper (citing Biddle)
Confirms polygraph results are inadmissible in Missouri courts even if parties stipulate to admission under Biddle.

Importantly, this ruling affects only courtroom admissibility — not the use of polygraph in law enforcement hiring, internal investigations, or criminal investigations. The polygraph remains a powerful and widely used investigative and screening tool throughout Missouri law enforcement. Research supports the value of polygraph as a decision-support tool in personnel selection, adding incremental validity to the hiring process [34]Verified Integration of Pre-Employment Polygraph Screening into the Police Selection Process
Confirms polygraph serves as a decision-support tool adding incremental validity to law enforcement personnel selection.

RSMo 595.223: Victim Polygraph Protection

Missouri RSMo 595.223 provides critical protections for crime victims. This statute prohibits any prosecuting or circuit attorney, peace officer, governmental official, or employee of a law enforcement agency from requesting or requiring a victim of sexual offenses (Chapter 566), domestic assault, or stalking to submit to any polygraph test or psychological stress evaluator exam as a condition for proceeding with a criminal investigation [35]Verified RSMo 595.223 – Polygraph tests and psychological stress evaluator exams not permitted, when
Confirms Missouri law prohibits requiring victims of sexual offenses, domestic assault, or stalking to take a polygraph as a condition for criminal investigation. This law, originally enacted as H.B. 583 in 2007 and subsequently amended, was transferred to its current location under Section 595.223, effective January 1, 2017 [36]Verified RSMo 595.223 – Legislative History
Confirms statute originally enacted as H.B. 583 (2007), amended by H.B. 215 (2013) and S.B. 491 (2014), transferred to 595.223 effective 1-01-17.

This victim protection statute reflects Missouri's balanced approach to polygraph testing. While the state recognizes the enormous value polygraph provides in law enforcement screening and investigations, it appropriately shields vulnerable crime victims from being subjected to testing as a precondition for justice. The American Polygraph Association supports similar victim protection measures nationwide. For more on this topic, see our guide on Missouri RSMo 595.223: Victim Polygraph Protection Law.

Polygraph in Internal Affairs Investigations

Beyond pre-employment screening, Missouri law enforcement agencies may also use polygraph testing in internal affairs investigations. Judicial precedent permits law enforcement agencies to require employees to submit to polygraph examinations during bona fide internal investigations, provided that strict procedural safeguards are observed, including proper rights advisements [37]Verified Use of Polygraph in Law Enforcement Internal Affairs Investigations
Confirms judicial precedent permits agencies to require polygraph during bona fide internal investigations with proper procedural safeguards. These procedural protections ensure fairness while allowing agencies to maintain accountability and integrity within their ranks.

The use of polygraph in internal affairs is one of the most impactful applications of the technology, as it helps maintain public trust in law enforcement institutions. For individuals involved in such situations, understanding your rights is essential. Our Whistleblowing & Polygraph: Prove Your Credibility guide offers additional insight into how polygraph testing can support truth-telling in investigative contexts.

Topics Covered in Pre-Employment Polygraph Exams

Missouri law enforcement polygraph examinations typically cover a consistent set of core topics designed to verify an applicant's suitability for a position of public trust. The Missouri State Highway Patrol covers employment history, traffic record, financial history, past and current illegal drug usage, record of criminal convictions, and basic honesty [3]Verified MSHP Commercial Vehicle Officer Career Bulletin
Confirms polygraph topics for CVO applicants and that employment is contingent upon successful polygraph completion. The Kansas City Police Department's polygraph covers criminal activity, drug usage, integrity, truthfulness, and employment history [11]Verified Kansas City Police Department Hiring Process – Step By Step
Confirms KCPD polygraph covers criminal activity, drug usage, integrity, truthfulness, and employment history for sworn and non-sworn positions.

These topic areas align with national best practices. A landmark national survey found that among large U.S. police agencies using pre-employment polygraph, agencies reported uncovering admissions to serious offenses that were not revealed through other screening methods, with approximately 25% of applicants rejected based on polygraph-derived information [5]Verified A national survey of practices, policies and evaluative comments on the use of pre-employment polygraph screening in police agencies in the United States
Confirms 62% of large U.S. police agencies use pre-employment polygraph, rejecting approximately 25% of applicants based on polygraph-derived information. The polygraph serves as a powerful complement to the background investigation, revealing information that candidates might otherwise withhold.

Preparing for Your Missouri Polygraph Exam

Applicants preparing for a Missouri law enforcement polygraph examination should focus on honesty and transparency. The polygraph examination is designed to verify and supplement the background investigation — not to trick applicants. Here are key preparation tips:

Be completely truthful on all application materials and questionnaires, as discrepancies will be explored during the polygraph. Get adequate rest the night before your exam. Take any prescribed medications as normal and inform the examiner about them. Arrive early and be prepared to spend several hours at the testing location. The MSHP notes that the main physiological recording measured during their examination is blood pressure [2]Verified MSHP Trooper Selection Process Pre-Employment Testing Document
Confirms polygraph is administered by a Patrol polygraphist and that applicants must sign a waiver prior to testing, though modern polygraph instruments also measure respiratory activity, cardiovascular activity, and electrodermal activity.

The evolution of polygraph from a pure detection tool to an interview-enhancing instrument that promotes confession and disclosure has made it an even more valuable component of the hiring process [38]Verified Interviewing and Interrogation for Law Enforcement
Confirms evolution of polygraph from detection tool to interview-enhancing instrument promoting confession and disclosure. Applicants who approach the exam with honesty and a cooperative attitude are well-positioned for success. For current polygraph test prices and available test locations across Missouri, check our resource pages.

The Science Behind Law Enforcement Screening Polygraph

Modern law enforcement polygraph screening programs benefit from decades of research refinement. The Directed Lie Screening Test (DLST) format, derived from validated Test for Espionage and Sabotage (TES) research, has demonstrated 98% accuracy for innocent examinees and 83.3% for guilty examinees in laboratory studies [9]Verified A focused polygraph technique for PCSOT and law enforcement screening programs
Confirms DLST derived from TES research achieves 98% accuracy for innocent and 83.3% for guilty examinees in laboratory studies. This standardized format uses two neutral questions, one sacrifice relevant question, two separate relevant questions, and two directed-lie comparison questions, providing a highly structured and reliable testing protocol [39]Verified Focused polygraph technique for PCSOT and law enforcement screening programs
Confirms standardized DLST format with specific question structure for law enforcement screening programs.

Recent research into psychophysiological assessment has continued to enhance the scientific foundation for polygraph use in law enforcement settings. A comprehensive review highlights the continued and growing need for integrity assessment tools in law enforcement, noting the polygraph's unique ability to identify risks that other screening methods miss [40]Verified To Use or Not to Use? Revisiting And Rethinking the Use of Polygraph and Psychophysiological Assessments in the Law Enforcement Setting
Confirms continued need for integrity assessment tools in law enforcement and highlights polygraph's role. For the latest peer-reviewed findings, visit our Polygraph Research Database.

Private Polygraph Testing and PCSOT

Beyond law enforcement hiring, polygraph testing serves numerous purposes in Missouri. Private polygraph examiners across the state provide services for civil and criminal cases, including divorce and fidelity matters, theft investigations, and various legal proceedings. Missouri-based polygraph firms also provide Post-Conviction Sex Offender Testing (PCSOT), which supplements treatment plans created by family and addiction therapists [41]Verified St. Louis Polygraph LLC
Confirms private polygraph services in Missouri including PCSOT, pre-employment, and EPPA compliance requirements.

All private-sector polygraph examinations involving employee theft must comply with the Employee Polygraph Protection Act of 1988 (EPPA), which establishes specific requirements and protections for examinees in the workplace context [41]Verified St. Louis Polygraph LLC
Confirms private polygraph services in Missouri including PCSOT, pre-employment, and EPPA compliance requirements. For couples considering relationship verification, our guide on Pre-Nuptial Polygraph: Why Couples Test Before Marriage explores an increasingly popular application.

Polygraph Use with Juvenile Subjects in Missouri

Missouri law enforcement agencies should be aware that polygraph testing may extend to juvenile subjects in certain investigative contexts. Research has found that 74.3% of surveyed law enforcement examiners had polygraphed at least one juvenile, with some testing children as young as 7 years old [42]Verified The use of law enforcement polygraph tests with juveniles
Confirms 74.3% of law enforcement examiners had polygraphed at least one juvenile, some as young as 7 years old. However, the same research noted that over half of examiners applied no special modifications for juvenile subjects, highlighting the importance of specialized protocols when testing younger individuals [42]Verified The use of law enforcement polygraph tests with juveniles
Confirms 74.3% of law enforcement examiners had polygraphed at least one juvenile, some as young as 7 years old. Missouri agencies conducting juvenile polygraph examinations should ensure their examiners follow established best practices.