State v. Lyons: Indiana’s Polygraph Discovery Case

Background and Facts of the Case

State v. Lyons, 211 N.E.3d 500 (Ind. 2023), is a significant Indiana Supreme Court decision addressing the consequences of failing to disclose critical changes to a polygraph examination's status [1]Verified State v. Lyons, 211 N.E.3d 500 (Ind. 2023) — Justia
Confirms the Indiana Supreme Court affirmed suppression of polygraph evidence and established two-part standard for discovery sanction exclusions under Trial Rule 37. In June 2017, five-year-old C.L. reported to her grandmother that she had been sexually abused by Bryan D. Lyons, her father [2]Verified Indiana Supreme Court Suppresses All Evidence Related to Polygraph Exam — Criminal Legal News
Confirms detailed facts of the Lyons case including the 2017 timeline, Gress's unilateral change, and Lyons' mental health disclosures. Bedford Police Detective Kevin Jones subsequently interviewed Lyons at the police department, where Lyons denied the allegations but agreed to sit for a polygraph examination [3]Verified STATE v. LYONS (2023) — FindLaw
Confirms full text of Indiana Supreme Court opinion including reciprocal discovery principles and Trial Rule 37 analysis.

Before he was represented by counsel, Lyons signed a written stipulation with the prosecutor agreeing that the results of his polygraph would be admissible if the State ultimately charged him with a crime [2]Verified Indiana Supreme Court Suppresses All Evidence Related to Polygraph Exam — Criminal Legal News
Confirms detailed facts of the Lyons case including the 2017 timeline, Gress's unilateral change, and Lyons' mental health disclosures. This is a key step under Indiana law, where polygraph results can only be admitted when specific prerequisites are satisfied [4]Verified Sanchez v. State, 675 N.E.2d 306 (Ind. 1996) — Justia
Confirms Indiana's four prerequisites for polygraph admissibility as established in Sanchez, Davidson, and Hare line of cases. Indiana State Police Sergeant Dan Gress was assigned to conduct the polygraph [5]Verified COA has 'little doubt' state violated discovery rule in child molesting case — The Indiana Lawyer
Confirms Court of Appeals unanimously affirmed trial court suppression, Bedford Police involvement, and Gress's failure to note the change.

During the pre-polygraph screening assessment, Lyons revealed he had been diagnosed with generalized anxiety, attention deficit, personality, and bipolar disorders [5]Verified COA has 'little doubt' state violated discovery rule in child molesting case — The Indiana Lawyer
Confirms Court of Appeals unanimously affirmed trial court suppression, Bedford Police involvement, and Gress's failure to note the change. He also explained that he saw "spiritual shadows" that spoke to him two or three days before the examination [5]Verified COA has 'little doubt' state violated discovery rule in child molesting case — The Indiana Lawyer
Confirms Court of Appeals unanimously affirmed trial court suppression, Bedford Police involvement, and Gress's failure to note the change. Based on these disclosures, Sergeant Gress determined that Lyons was not a suitable candidate for an evidentiary polygraph and unilaterally converted the examination to a non-stipulated investigatory polygraph—the results of which would not be admissible in court [5]Verified COA has 'little doubt' state violated discovery rule in child molesting case — The Indiana Lawyer
Confirms Court of Appeals unanimously affirmed trial court suppression, Bedford Police involvement, and Gress's failure to note the change. Critically, Gress did not inform Lyons, the prosecutor, or defense counsel of this change [6]Verified State v. Lyons, No. 21A-CR-2187 (Ind. Ct. App., May 11, 2022) — Case Clips
Confirms the timeline of events including June 2017 reporting, July 2017 charges, and July 2021 trial date when non-stipulation was discovered. For more on polygraph results confidentiality and who can see your report, understanding how examination records are handled is essential.

The Discovery Violation

After the polygraph was administered, Sergeant Gress concluded that Lyons' results revealed "significant reactions" to questions about his daughter that were "very close to deception" [5]Verified COA has 'little doubt' state violated discovery rule in child molesting case — The Indiana Lawyer
Confirms Court of Appeals unanimously affirmed trial court suppression, Bedford Police involvement, and Gress's failure to note the change. When confronted with these results, Lyons made incriminating statements within minutes [5]Verified COA has 'little doubt' state violated discovery rule in child molesting case — The Indiana Lawyer
Confirms Court of Appeals unanimously affirmed trial court suppression, Bedford Police involvement, and Gress's failure to note the change. In July 2017, Lyons was charged with Level 1 felony child molesting [7]Verified State v. Lyons, No. 21A-CR-02187 — State of Indiana Official Events
Confirms the Indiana Supreme Court oral argument information and case summary for the Lyons appeal.

Lyons filed a motion to suppress the polygraph on the basis that he had not been advised of his right to counsel before signing the stipulation [7]Verified State v. Lyons, No. 21A-CR-02187 — State of Indiana Official Events
Confirms the Indiana Supreme Court oral argument information and case summary for the Lyons appeal. At the hearing on this motion, law enforcement officials testified but—because they were not asked the question directly—did not reveal that the polygraph had been changed to non-stipulated [7]Verified State v. Lyons, No. 21A-CR-02187 — State of Indiana Official Events
Confirms the Indiana Supreme Court oral argument information and case summary for the Lyons appeal. Sergeant Gress never mentioned his unilateral change during the hearing despite extensive questioning about Lyons' mental state [6]Verified State v. Lyons, No. 21A-CR-2187 (Ind. Ct. App., May 11, 2022) — Case Clips
Confirms the timeline of events including June 2017 reporting, July 2017 charges, and July 2021 trial date when non-stipulation was discovered. The trial court denied the motion to suppress, and the case moved toward a five-day trial [7]Verified State v. Lyons, No. 21A-CR-02187 — State of Indiana Official Events
Confirms the Indiana Supreme Court oral argument information and case summary for the Lyons appeal.

On the eve of trial—four years after the investigation began and one year after the motion to suppress—the prosecutor interviewed Gress and learned for the first time that the examination had been changed from stipulated to non-stipulated based on Lyons' mental state [6]Verified State v. Lyons, No. 21A-CR-2187 (Ind. Ct. App., May 11, 2022) — Case Clips
Confirms the timeline of events including June 2017 reporting, July 2017 charges, and July 2021 trial date when non-stipulation was discovered. The prosecutor promptly informed defense counsel and the court [6]Verified State v. Lyons, No. 21A-CR-2187 (Ind. Ct. App., May 11, 2022) — Case Clips
Confirms the timeline of events including June 2017 reporting, July 2017 charges, and July 2021 trial date when non-stipulation was discovered. The trial court granted a defense motion to delay the trial and ordered the State to investigate whether Gress had committed perjury at the earlier suppression hearing [6]Verified State v. Lyons, No. 21A-CR-2187 (Ind. Ct. App., May 11, 2022) — Case Clips
Confirms the timeline of events including June 2017 reporting, July 2017 charges, and July 2021 trial date when non-stipulation was discovered. Understanding the ethical responsibilities of a polygraph examiner is essential context for appreciating why this case is so significant.

Excluding All Evidence from Sergeant Gress

Following a renewed suppression hearing, the trial court found Gress' explanations not credible and sanctioned the State for what it described as an "egregious discovery violation" [8]Verified State v. Lyons, 189 N.E.3d 605 (Ind. Ct. App. 2022) — Court of Appeals Opinion
Confirms the Court of Appeals' finding that discovery violation caused prejudice to Lyons' defense and that post-polygraph statements were properly excluded as sanctions. The court entered a detailed order excluding "any and all evidence generated or acquired by Sergeant Dan Gress," including Lyons' agreement to take a polygraph, the polygraph results themselves, and the incriminating post-polygraph statements [9]Verified STATE v. LYONS — FindLaw (full Supreme Court opinion)
Confirms the detailed suppression order excluding all evidence generated by Sergeant Gress and the State's admission of late disclosure.

The trial court concluded that the State of Indiana had violated Lyons' rights by failing to disclose "materially exculpatory evidence" and had "materially breached" Indiana Trial Rule 37(B)(2) by not disclosing in a timely manner that the polygraph had been changed to non-stipulated [7]Verified State v. Lyons, No. 21A-CR-02187 — State of Indiana Official Events
Confirms the Indiana Supreme Court oral argument information and case summary for the Lyons appeal. The court wrote that it found the late disclosure "troubling," noting the dangers when law enforcement keeps material evidence from the prosecutor [6]Verified State v. Lyons, No. 21A-CR-2187 (Ind. Ct. App., May 11, 2022) — Case Clips
Confirms the timeline of events including June 2017 reporting, July 2017 charges, and July 2021 trial date when non-stipulation was discovered. For those interested in how Indiana's polygraph certification requirements under IC 25-30-2 shape examiner qualifications, Gress's handling of this case illustrates why professional standards matter.

Court of Appeals Affirms Unanimously

The State filed an interlocutory appeal, arguing it was a case of "misfeasance not malfeasance" because the prosecutor immediately informed Lyons upon learning the polygraph was non-stipulated [7]Verified State v. Lyons, No. 21A-CR-02187 — State of Indiana Official Events
Confirms the Indiana Supreme Court oral argument information and case summary for the Lyons appeal. The State also contended that the exclusion of Lyons' separately admissible post-polygraph statements was an unjust sanction [7]Verified State v. Lyons, No. 21A-CR-02187 — State of Indiana Official Events
Confirms the Indiana Supreme Court oral argument information and case summary for the Lyons appeal.

The Court of Appeals of Indiana affirmed the trial court's order in a unanimous published opinion in May 2022 (State v. Lyons, 189 N.E.3d 605) [10]Verified MCPO Casebook — Polygraph Evidence in Indiana
Confirms Indiana case law on polygraph inadmissibility as a general rule and the detailed four-prerequisite framework from multiple Indiana cases. Chief Judge Cale Bradford wrote that the appellate panel had "little doubt" that a discovery violation took place because there were ample pretrial opportunities for disclosing that the polygraph was non-stipulated [7]Verified State v. Lyons, No. 21A-CR-02187 — State of Indiana Official Events
Confirms the Indiana Supreme Court oral argument information and case summary for the Lyons appeal. The court noted it was "easy to imagine a scenario in which Lyons entered into a plea agreement with the State before ever finding out that the polygraph results would not have been admissible in a trial" [8]Verified State v. Lyons, 189 N.E.3d 605 (Ind. Ct. App. 2022) — Court of Appeals Opinion
Confirms the Court of Appeals' finding that discovery violation caused prejudice to Lyons' defense and that post-polygraph statements were properly excluded as sanctions. Research has documented how state supreme courts across the country treat polygraph evidence inconsistently, with jurisdictions adopting per se bans, stipulation requirements, or case-by-case discretion [11]Verified Appendix B: State Supreme Court Decisions for Polygraph Evidence
Confirms inconsistent treatment of polygraph evidence across state supreme courts including stipulation requirements and per se bans.

The Two-Part Discovery Sanctions Standard

The Indiana Supreme Court granted transfer and issued its opinion on June 27, 2023 [1]Verified State v. Lyons, 211 N.E.3d 500 (Ind. 2023) — Justia
Confirms the Indiana Supreme Court affirmed suppression of polygraph evidence and established two-part standard for discovery sanction exclusions under Trial Rule 37. The Court held that before excluding evidence as a Trial Rule 37 discovery sanction, a trial court must find either: (1) that the exclusion is the sole remedy available to avoid substantial prejudice, or (2) that the sanctioned party's culpability reflects an egregious discovery violation [1]Verified State v. Lyons, 211 N.E.3d 500 (Ind. 2023) — Justia
Confirms the Indiana Supreme Court affirmed suppression of polygraph evidence and established two-part standard for discovery sanction exclusions under Trial Rule 37.

The Court examined the trial court's order for abuse of discretion, meaning reversal was only appropriate if the decision was clearly against the logic and effect of the facts before the court or if the trial court misinterpreted the law [8]Verified State v. Lyons, 189 N.E.3d 605 (Ind. Ct. App. 2022) — Court of Appeals Opinion
Confirms the Court of Appeals' finding that discovery violation caused prejudice to Lyons' defense and that post-polygraph statements were properly excluded as sanctions. Citing Wiseheart v. State, 491 N.E.2d 985 (Ind. 1986), the Court noted that evidence exclusion should be reserved for situations where the discovery violation was "intentional, flagrant, in bad faith, or otherwise reprehensible" [8]Verified State v. Lyons, 189 N.E.3d 605 (Ind. Ct. App. 2022) — Court of Appeals Opinion
Confirms the Court of Appeals' finding that discovery violation caused prejudice to Lyons' defense and that post-polygraph statements were properly excluded as sanctions. Courts exclude evidence only as a last resort because that remedy frustrates a trial's truth-seeking function [1]Verified State v. Lyons, 211 N.E.3d 500 (Ind. 2023) — Justia
Confirms the Indiana Supreme Court affirmed suppression of polygraph evidence and established two-part standard for discovery sanction exclusions under Trial Rule 37.

The Court found that the trial court's order fell within these limits and affirmed the suppression [1]Verified State v. Lyons, 211 N.E.3d 500 (Ind. 2023) — Justia
Confirms the Indiana Supreme Court affirmed suppression of polygraph evidence and established two-part standard for discovery sanction exclusions under Trial Rule 37. Because the trial court found Gress's level of culpability to be egregious, and the record supported that conclusion, the trial court did not abuse its discretion [9]Verified STATE v. LYONS — FindLaw (full Supreme Court opinion)
Confirms the detailed suppression order excluding all evidence generated by Sergeant Gress and the State's admission of late disclosure. This approach parallels how polygraph evidence is treated in Ontario criminal courts, where courts also carefully scrutinize the circumstances surrounding polygraph administration.

Implications for Reciprocal Discovery Obligations

The Court emphasized that in Indiana criminal discovery, the principle of reciprocity requires that discovery rules be "fairly balanced between the State and the defendant" [1]Verified State v. Lyons, 211 N.E.3d 500 (Ind. 2023) — Justia
Confirms the Indiana Supreme Court affirmed suppression of polygraph evidence and established two-part standard for discovery sanction exclusions under Trial Rule 37. Both the State and defendants are held to the same standard, and the discovery rules are most effective through equal treatment [1]Verified State v. Lyons, 211 N.E.3d 500 (Ind. 2023) — Justia
Confirms the Indiana Supreme Court affirmed suppression of polygraph evidence and established two-part standard for discovery sanction exclusions under Trial Rule 37.

Importantly, the Court cited Kyles v. Whitley, 514 U.S. 419 (1995) for the principle that an individual prosecutor has a duty to learn of any favorable evidence known to others acting on the government's behalf, including the police [8]Verified State v. Lyons, 189 N.E.3d 605 (Ind. Ct. App. 2022) — Court of Appeals Opinion
Confirms the Court of Appeals' finding that discovery violation caused prejudice to Lyons' defense and that post-polygraph statements were properly excluded as sanctions. This means that even though the individual prosecutor in Lyons may not have personally known about Gress's unilateral change, the State was still accountable for the failure to disclose. This ruling has significant implications for how law enforcement agencies and prosecutors' offices manage communication about polygraph examination results. Those considering polygraph examinations should understand their rights—including polygraph testing for drug use allegations and employee rights.

The Sanchez v. State Framework

State v. Lyons is best understood within Indiana's established framework for polygraph admissibility. As set forth in Sanchez v. State (675 N.E.2d 306, Ind. 1996), Davidson v. State (558 N.E.2d 1077, Ind. 1990), and Hare v. State (467 N.E.2d 7, Ind. 1984), there are four prerequisites that must be met before a trial court may admit polygraph test results [4]Verified Sanchez v. State, 675 N.E.2d 306 (Ind. 1996) — Justia
Confirms Indiana's four prerequisites for polygraph admissibility as established in Sanchez, Davidson, and Hare line of cases:

1. Written Stipulation: The prosecutor, defendant, and defense counsel must all sign a written stipulation providing for the defendant's submission to the examination and for the subsequent admission at trial of the results [4]Verified Sanchez v. State, 675 N.E.2d 306 (Ind. 1996) — Justia
Confirms Indiana's four prerequisites for polygraph admissibility as established in Sanchez, Davidson, and Hare line of cases.

2. Court Discretion on Qualifications: Notwithstanding the stipulation, the admissibility of the test results is at the trial court's discretion regarding the examiner's qualifications and the test conditions [4]Verified Sanchez v. State, 675 N.E.2d 306 (Ind. 1996) — Justia
Confirms Indiana's four prerequisites for polygraph admissibility as established in Sanchez, Davidson, and Hare line of cases.

3. Right to Cross-Examination: The opposing party shall have the right to cross-examine the polygraph examiner if his or her graphs and opinion are offered into evidence [4]Verified Sanchez v. State, 675 N.E.2d 306 (Ind. 1996) — Justia
Confirms Indiana's four prerequisites for polygraph admissibility as established in Sanchez, Davidson, and Hare line of cases.

4. Jury Instruction: The jury must be instructed that, at most, the examiner's testimony tends only to show whether the defendant was being truthful at the time of the examination, and that it is for the jury to determine the weight and effect to be given to the examiner's testimony [4]Verified Sanchez v. State, 675 N.E.2d 306 (Ind. 1996) — Justia
Confirms Indiana's four prerequisites for polygraph admissibility as established in Sanchez, Davidson, and Hare line of cases.

These four prerequisites ensure that polygraph evidence is used responsibly in Indiana courts. For a deeper look at Sanchez v. State's four polygraph admissibility rules, see our dedicated analysis. Indiana is among the states that permit stipulated polygraph evidence, making it a jurisdiction where polygraph testing can play a meaningful role in the criminal justice process [11]Verified Appendix B: State Supreme Court Decisions for Polygraph Evidence
Confirms inconsistent treatment of polygraph evidence across state supreme courts including stipulation requirements and per se bans. Research on polygraph evidence admissibility in court has found that jurors do not blindly accept polygraph evidence but do factor it meaningfully into their assessments [12]Verified The admissibility of polygraph evidence in court: Some empirical findings
Confirms that mock jurors do not blindly accept polygraph evidence but shift guilt ratings meaningfully in presence of exculpatory polygraph results.

Why the Stipulation Requirement Matters

The Lyons case dramatically illustrates why the stipulation requirement is the cornerstone of polygraph admissibility in Indiana. When Gress unilaterally converted the examination from stipulated to non-stipulated, he effectively nullified the very agreement that would have made the polygraph results admissible [5]Verified COA has 'little doubt' state violated discovery rule in child molesting case — The Indiana Lawyer
Confirms Court of Appeals unanimously affirmed trial court suppression, Bedford Police involvement, and Gress's failure to note the change. The defendant continued operating under the belief that the original stipulation was intact, which potentially influenced his litigation strategy for years [7]Verified State v. Lyons, No. 21A-CR-02187 — State of Indiana Official Events
Confirms the Indiana Supreme Court oral argument information and case summary for the Lyons appeal.

In Indiana, polygraph examinations are generally not admissible as evidence due to concerns about their potential to cause juries to make erroneous inferences [13]Verified Indiana Code Title 25, Article 30, Chapter 2 — Regulation of Polygraph Examiners by State Police
Confirms IC 25-30-2 requires certificates of competence from Indiana State Police and defines polygraph examiners and instruments. The stipulation process exists as a carefully designed safeguard—when all parties agree to admit polygraph results, each side has voluntarily accepted the examination's potential impact on the case. Under Indiana Code 25-30-2, the Indiana State Police Department issues certificates of competence to polygraph examiners who meet established training and experience standards [14]Verified Indiana Code § 25-30-2-1 — Definitions
Confirms the statutory definition of polygraph examiner and polygraph instrument under Indiana law. Aspiring examiners who want to practice in Indiana can learn more about certification requirements through our Indiana Polygraph Certification: IC 25-30-2 guide. For those interested in broader examiner qualifications, the Indiana Polygraph Association provides professional resources and continuing education opportunities.

Indiana Trial Rule 37 and Discovery Sanctions

Indiana Trial Rule 37 provides trial courts with mechanisms to ensure compliance with discovery obligations [15]Verified Indiana Rules of Trial Procedure — Rule 37: Failure to make or cooperate in discovery: Sanctions
Confirms the text of Indiana Trial Rule 37 authorizing courts to exclude evidence and impose sanctions for discovery violations. Under Trial Rule 37(B)(2), when a party fails to obey a discovery order, the court may make orders that are "just," including prohibiting the disobedient party from introducing designated matters in evidence [15]Verified Indiana Rules of Trial Procedure — Rule 37: Failure to make or cooperate in discovery: Sanctions
Confirms the text of Indiana Trial Rule 37 authorizing courts to exclude evidence and impose sanctions for discovery violations. The rule grants courts wide discretion in fashioning remedies, from awarding expenses and attorney's fees for minor infractions to striking pleadings or dismissing actions for severe violations [15]Verified Indiana Rules of Trial Procedure — Rule 37: Failure to make or cooperate in discovery: Sanctions
Confirms the text of Indiana Trial Rule 37 authorizing courts to exclude evidence and impose sanctions for discovery violations.

The Lyons decision clarifies the standard Indiana courts should apply when considering the most severe sanction—evidence exclusion. The Supreme Court's two-part test requires finding either that exclusion is the sole remedy to avoid substantial prejudice or that the violation was egregious [1]Verified State v. Lyons, 211 N.E.3d 500 (Ind. 2023) — Justia
Confirms the Indiana Supreme Court affirmed suppression of polygraph evidence and established two-part standard for discovery sanction exclusions under Trial Rule 37. This balances the need for meaningful sanctions against the risk of undermining the truth-seeking function of trials.

Relationship to Federal Polygraph Standards

Indiana's stipulation-based approach to polygraph admissibility stands in contrast to the approach taken by many federal courts. The U.S. Supreme Court addressed polygraph evidence in United States v. Scheffer, 523 U.S. 303 (1998), holding that a per se exclusion of polygraph evidence in military courts did not violate the Sixth Amendment right to present a defense [16]Verified United States v. Scheffer, 523 U.S. 303 (1998) — Justia
Confirms the U.S. Supreme Court upheld per se exclusion of polygraph evidence in military courts and left admissibility to individual states. However, the Court left the question of polygraph admissibility to individual states, and Justice Kennedy's concurrence acknowledged that advances in the field may support greater use of polygraph examinations [16]Verified United States v. Scheffer, 523 U.S. 303 (1998) — Justia
Confirms the U.S. Supreme Court upheld per se exclusion of polygraph evidence in military courts and left admissibility to individual states.

Scholar Gallai (1999) argued that polygraph evidence fails to meet Daubert reliability standards and creates substantial prejudicial effects under Rule 403, favoring continued inadmissibility in federal courts [17]Verified Polygraph evidence in federal courts: Should it be admissible?
Analyzes whether polygraph evidence meets Daubert standards in federal courts and examines prejudicial effects under Rule 403. However, Indiana's approach recognizes that when proper safeguards are in place—including written stipulation, qualified examiners, cross-examination, and limiting jury instructions—polygraph evidence can serve a valuable evidentiary purpose. Research on how courts handle scientific evidence, including fMRI lie detection and its applicability to polygraph testing, provides additional context for understanding evolving admissibility standards [18]Verified fMRI Lie Detection Validity and Admissibility as Evidence in Court
Discusses the Sixth Circuit's rejection of fMRI lie detection and its applicability to evolving polygraph admissibility standards.

For individuals in Indiana who may benefit from a polygraph examination, our lie detector test services in Indiana provide professionally administered examinations by professional examiners. You can also book a polygraph test directly through our platform.

Impact on Law Enforcement Polygraph Practices

The Lyons case has practical implications for law enforcement agencies conducting polygraph examinations in Indiana. The Indiana State Police Polygraph Unit provides polygraph services to the Indiana State Police and other state, county, and local law enforcement agencies [19]Verified ISP Labs: Polygraph Unit
Confirms the Indiana State Police Polygraph Unit provides polygraph services to ISP and other law enforcement agencies. Examiners must hold a certificate of competence issued by the Indiana State Police Department under Indiana Code 25-30-2-2, which requires evidence of formal training, experience, and competence in polygraph instrument operation [14]Verified Indiana Code § 25-30-2-1 — Definitions
Confirms the statutory definition of polygraph examiner and polygraph instrument under Indiana law.

The case highlights several best practices for polygraph examiners in law enforcement settings: any change to the status of an examination—from stipulated to non-stipulated—must be immediately documented and communicated to all parties; pre-examination suitability assessments must be transparent; and examiners must fully disclose their findings and decisions during subsequent legal proceedings. For those interested in law enforcement polygraph pre-employment requirements in Indiana, understanding these protocols is essential.

The ethical responsibilities of a polygraph examiner are central to maintaining the integrity of the profession and ensuring that polygraph evidence serves justice effectively. Aspiring examiners can explore career paths through our guide on how to become a polygraph examiner, which covers training, certification, and career opportunities.

What This Case Means for Defendants

State v. Lyons provides important protections for defendants in Indiana who agree to stipulated polygraph examinations. The decision confirms that when the State or its agents fail to disclose material information about the nature of a polygraph examination, the resulting evidence may be suppressed entirely—including post-polygraph statements that would otherwise be independently admissible [1]Verified State v. Lyons, 211 N.E.3d 500 (Ind. 2023) — Justia
Confirms the Indiana Supreme Court affirmed suppression of polygraph evidence and established two-part standard for discovery sanction exclusions under Trial Rule 37. Defendants should be aware that under Indiana law, polygraph results are generally inadmissible unless all four Sanchez prerequisites are satisfied [4]Verified Sanchez v. State, 675 N.E.2d 306 (Ind. 1996) — Justia
Confirms Indiana's four prerequisites for polygraph admissibility as established in Sanchez, Davidson, and Hare line of cases.

The case also underscores the importance of legal representation when considering a polygraph examination. Lyons signed the stipulation before he was represented by counsel [2]Verified Indiana Supreme Court Suppresses All Evidence Related to Polygraph Exam — Criminal Legal News
Confirms detailed facts of the Lyons case including the 2017 timeline, Gress's unilateral change, and Lyons' mental health disclosures, and the subsequent complications illustrate why having experienced legal advice before agreeing to any polygraph examination is critical. For those considering a polygraph, understanding your rights regarding polygraph testing, including whether a child can take a lie detector test, is important context.

What This Case Means for Prosecutors and Law Enforcement

For prosecutors, Lyons reinforces the obligation to learn of favorable evidence known to others acting on the government's behalf, including police officers [8]Verified State v. Lyons, 189 N.E.3d 605 (Ind. Ct. App. 2022) — Court of Appeals Opinion
Confirms the Court of Appeals' finding that discovery violation caused prejudice to Lyons' defense and that post-polygraph statements were properly excluded as sanctions. The prosecutor in this case acted promptly upon learning of the non-stipulated designation, but the years-long delay in disclosure was attributed to law enforcement's failure to communicate the change [6]Verified State v. Lyons, No. 21A-CR-2187 (Ind. Ct. App., May 11, 2022) — Case Clips
Confirms the timeline of events including June 2017 reporting, July 2017 charges, and July 2021 trial date when non-stipulation was discovered.

Law enforcement agencies should implement clear protocols for documenting and communicating any changes to polygraph examination status. The failure to change the stipulation notation on the polygraph examination form—a seemingly minor clerical oversight—led to years of litigation and the ultimate suppression of key evidence [5]Verified COA has 'little doubt' state violated discovery rule in child molesting case — The Indiana Lawyer
Confirms Court of Appeals unanimously affirmed trial court suppression, Bedford Police involvement, and Gress's failure to note the change. The Bruce Bongar: Forensic Psychology's Bridge to Polygraph explores how forensic psychology and polygraph testing intersect in legal settings.

Research on how legal professionals assess credibility demonstrates the complex interplay between scientific evidence and judicial decision-making, further underscoring the need for transparent polygraph practices [20]Verified How Dutch legal professionals assess statement credibility
Foundational research relevant to how legal professionals assess credibility evidence including polygraph. Additionally, research on neuroimaging evidence admissibility in U.S. courts shows that courts apply heightened scrutiny to emerging forensic technologies [21]Verified Flickering Admissibility: Neuroimaging Evidence in the US Courts
Confirms courts apply greater skepticism to functional neuroimaging technologies including lie detection methods.