Discredited Forensic Microscopy as “False Evidence”: HRPP Rule 40 Relief When Science Invalidates Trial Expert Testimony

1. Introduction

Case: Granillo v. State, SCWC-22-0000740 (Haw. July 15, 2026).
Parties: Daniel R. Granillo (Petitioner/Petitioner-Appellant) v. State of Hawaiʻi (Respondent/Respondent-Appellee).
Posture: Certiorari to the Intermediate Court of Appeals (ICA), arising from denial of an HRPP Rule 40 post-conviction petition.

The prosecution’s 1990 jury conviction of Granillo for kidnapping and sexual assaults relied heavily on FBI microscopic hair and fiber comparison testimony from Agent Wayne Oakes. Decades later, the U.S. Department of Justice (DOJ) notified Maui prosecutors that Oakes’s hair testimony in this case “exceed[ed] the limits of the science.” Granillo sought HRPP Rule 40 relief, arguing that both the hair and fiber testimony were scientifically invalid.

The central legal issues were:

  • Standard of review/relief: Whether claims that trial expert testimony has been scientifically discredited are governed by the State v. McNulty newly discovered evidence test, or by the constitutional “false evidence” due process standard.
  • Scope of scientific invalidation: Whether, notwithstanding DOJ’s hair-focused review, the fiber testimony should also be treated as invalid in light of broader scientific developments.
  • Judicial notice: Whether the court may judicially notice the 2009 NRC Report and 2016 PCAST Report on forensic feature-comparison limits.

2. Summary of the Opinion

The Hawaiʻi Supreme Court vacated the ICA judgment, vacated the Rule 40 denial, and remanded for a new trial.

The court announced a major doctrinal holding: “We hold that when scientific developments invalidate evidence presented at trial, the false evidence standard applies.” In this “unique category of invalidated scientific evidence,” the McNulty newly discovered evidence framework “has no application.”

Applying that standard, the court concluded that Agent Oakes’s microscopic fiber testimony—like his hair testimony—“exceeded the science” and was therefore false evidence. Because there was a reasonable possibility the false fiber evidence contributed to the conviction, Granillo’s article I, section 5 due process right to a fair trial was violated.

3. Analysis

3.1. Precedents Cited

A. The governing post-conviction framework: rejecting “newly discovered evidence”

  • State v. McNulty, 60 Haw. 259, 267-68, 588 P.2d 438, 445 (1978).
    The ICA treated the DOJ letter as “newly discovered evidence,” applying McNulty and denying relief as “cumulative.” The Supreme Court held this was doctrinally mismatched because discredited science is not “new evidence” of historical facts; it is proof that the jury heard evidence that was “untrue — not new.”
  • Haw. Police Dep't, Cnty. of Haw. v. Kubota, 155 Hawaiʻi 136, 145, 557 P.3d 865, 874 (2024).
    Cited for the articulation of the McNulty test; used to contrast the “would probably change the result” burden with the materially-false-evidence inquiry the court adopted here.
  • State v. Mabuti, 72 Haw. 106, 112, 807 P.2d 1264, 1268 (1991) and State v. Caraballo, 62 Haw. 309, 316-18, 615 P.2d 91, 97 (1980).
    Used to illustrate the kinds of “new facts” (new witnesses, etc.) for which McNulty is suited—highlighting that this case instead involves a later scientific consensus that prior expert conclusions lacked validity.
  • McCrory v. Alabama, 144 S. Ct. 2483, 2487 (Mem) (2024) (Sotomayor, J., statement respecting the denial of certiorari).
    Used for conceptual clarity: “newly-discredited forensic evidence” differs from new witnesses or new DNA; it is “simply a scientific consensus that the old evidence was unreliable.”

B. Constitutional “false evidence” due process line (Hawaiʻi and federal)

  • Birano v. State, 143 Hawaiʻi 163, 181-82, 426 P.3d 387, 405-06 (2018) and State v. Stone, 147 Hawaiʻi 255, 271-72, 465 P.3d 702, 718-19 (2020).
    Foundational Hawaiʻi authority that due process is violated when there is a “reasonable possibility” that false evidence contributed to the conviction. The court relied on Stone for the “reasonable possibility” materiality formulation and for the principle that prosecutorial “good faith” does not control whether a defendant received a fair trial.
  • State v. Hirata, 152 Hawaiʻi 27, 33, 520 P.3d 225, 231 (2022).
    Used to emphasize how low the “reasonable possibility” threshold can be in practice: if it is reasonably possible a single juror would have voted differently, materiality is satisfied.
  • Mooney v. Holohan, 294 U.S. 103, 112 (1935); Napue v. Illinois, 360 U.S. 264, 269 (1959); Giglio v. United States, 405 U.S. 150, 153-54 (1972); United States v. Agurs, 427 U.S. 97, 104 (1976).
    These anchor the due process idea that convictions resting on false evidence corrupt the “truth-seeking function.” The opinion uses them to situate Hawaiʻi’s protection within a broader constitutional tradition, while stressing Hawaiʻi’s independent constitutional analysis.
  • Mesarosh v. United States, 352 U.S. 1, 9 (1956) and Evenstad v. Carlson, 470 F.3d 777, 783 (8th Cir. 2006).
    Cited in discussing the unresolved federal question whether “unknowing” use of false evidence violates due process—and to support Hawaiʻi’s choice to focus on verdict integrity rather than prosecutorial knowledge.
  • United States v. Butler, 955 F.3d 1052, 1057-58 (D.C. Cir. 2020).
    Highly influential comparator case: post-conviction relief granted after DOJ repudiated microscopic hair testimony that “exceeded the limits of science.” The Hawaiʻi court used Butler as a close analog for treating later-invalidated forensic microscopy as “false evidence” and focusing the inquiry on materiality.
  • Glossip v. Oklahoma, 604 U.S. 226 (2025).
    Discussed in rejecting the notion that federal doctrine forecloses Hawaiʻi from granting relief absent prosecutorial knowledge; the court treated Glossip as a knowing-use case that does not resolve the discredited-science problem.
  • Ex Parte Warner, 721 S.W.3d 436, 445 (Tex. Crim. App. 2025) (Finley, J., concurring).
    Addressed and discounted as nonbinding, and as reflecting federal-centric constraints not adopted for article I, section 5.

C. Evidentiary reliability, expert testimony, and the “aura” problem

  • State v. David, 149 Hawaiʻi 469, 478, 494 P.3d 1202, 1211 (2021) and State v. Batangan, 71 Haw. 552, 556, 799 P.2d 48, 51 (1990).
    Used to explain why expert testimony can overwhelm juror judgment (“aura of special reliability and trustworthiness”), supporting the court’s materiality finding.
  • State v. Spies, 157 Hawaiʻi 75, 88, 575 P.3d 708, 721 (2025).
    Invoked to connect present-day admissibility norms (reliability and trustworthiness thresholds) with why Oakes’s fiber opinions would not be admitted today.
  • State v. Veikoso, 126 Hawaiʻi 267, 276, 280, 270 P.3d 997, 1006, 1010 (2011).
    The Rule 40 court used Veikoso-style harmless error analysis for “improperly admitted evidence”; the Supreme Court held the wrong standard was applied for this category of falsity revealed by later scientific developments.

D. Judicial notice and the evolution from older forensic assumptions

  • State v. Vliet, 95 Hawaiʻi 94, 112-13, 19 P.3d 42, 60-61 (2001); State v. Ito, 90 Hawaiʻi 225, 243, 978 P.2d 191, 209 (App. 1999); State v. Montalbo, 73 Haw. 130, 141, 828 P.2d 1274, 1281 (1992).
    These cases supply doctrinal legitimacy for appellate judicial notice of scientific principles/techniques and show Hawaiʻi courts’ historic practice of acknowledging scientific consensus.
  • State v. Fukusaku, 85 Hawaiʻi 462, 474, 946 P.2d 32, 44 (1997).
    A key pivot point: Fukusaku had described hair and fiber evidence as “well-established and of proven reliability.” The court treated that as reflective of the era’s consensus—explicitly concluding that consensus “no longer holds” in light of the 2009 NRC and 2016 PCAST reports.
  • State v. Puaoi, 78 Hawaiʻi 185, 190, 891 P.2d 272, 277 (1995) and Off. of Hawaiian Affs. v. State, 96 Hawaiʻi 388, 396 n.13, 31 P.3d 901, 909 n.13 (2001).
    Cited for the proposition that appellate courts may take judicial notice of facts and government documents that are readily determinable from indisputably accurate sources.

E. State constitutional independence (contextual but cited)

  • State v. Wilson, 154 Hawaiʻi 8, 14, 543 P.3d 440, 446 (2024).
    Cited to reinforce that Hawaiʻi interprets its constitution independently and is not “tethered” to evolving U.S. Supreme Court due process analysis.
  • The opinion also cites multiple U.S. Supreme Court decisions in support of its broader state-constitutional framing (including Dobbs v. Jackson Women's Health Org., 597 U.S. 215 (2022), and others). In doctrinal terms for this case, that discussion serves chiefly to justify why Hawaiʻi’s due process analysis under article I, section 5 need not adopt any federal “knowledge” prerequisite.

3.2. Legal Reasoning

A. The new rule: discredited science is treated as “false evidence,” not “newly discovered evidence”

The court’s core move is categorical: when later scientific developments demonstrate that trial expert testimony exceeded what the discipline could validly claim, the testimony is treated as never-true evidence. The proper inquiry is therefore constitutional: whether false evidence contributed to conviction.

This matters because McNulty asks whether “new” evidence would “probably change the result” of a retrial—an inquiry the court viewed as poorly suited to “subtracting” false scientific evidence that may have shaped the original jury’s decision-making and the defense’s strategy.

B. Judicial notice: NRC (2009) and PCAST (2016) to define the discipline’s limits

The court took judicial notice of the 2009 NRC Report and 2016 PCAST Report, narrowly “only as to their findings on the scientific limitations of hair and fiber comparison and expert testimony based on feature-comparison methods.”

Functionally, judicial notice allowed the court to treat the reports as authoritative sources establishing two adjudicative facts:

  • scientific consensus on microscopic comparison methods’ basis and limits has changed decisively over time; and
  • there are defined constraints on what experts may claim about source attribution, statistical weight, and reliability.

C. Fiber testimony: why it was “false” under modern scientific understanding

A notable aspect of the decision is its refusal to treat DOJ’s silence on fiber as validation. The court emphasized: “Silence is not endorsement.” Because the NRC Report stated fibers can be examined “in the same way as hairs, and with the same limitations,” the court treated Oakes’s fiber conclusions as equally exceeding the science.

The court identified multiple ways Oakes’s fiber opinions overreached, including (as framed by the opinion) improper “individualization” (source attribution), unwarranted certainty (“microscopically identical/the same”), concealment of class-evidence limitations, lack of validation/error-rate grounding, and absence of distinctive environmental characteristics that might even arguably narrow a manufacturing lot.

D. Materiality (reasonable possibility): why the error required a new trial

Applying Stone and Hirata, the court asked whether there was a “reasonable possibility” the false fiber evidence contributed to conviction. The court emphasized:

  • the State made hair/fiber evidence a “centerpiece,” from opening statement through closing;
  • Price’s credibility was contested through inconsistencies, and forensic testimony bolstered her account;
  • fiber testimony did more than place Price in the car; it supported the prosecution’s theory that she was in the car with her pants off/underwear exposed;
  • the FBI expert’s authority magnified the evidence’s persuasive force (“aura of special reliability and trustworthiness”).

On this record, the court rejected the Rule 40 court’s conclusion of “overwhelming and compelling” evidence independent of the forensic testimony, finding the forensic link to the car—especially “pants off” corroboration—was consequential.

E. Knowledge not required under article I, section 5 for this category

A further doctrinal clarification: the court held that in discredited-science cases “whether the State knew or should have known the testimony was false at trial is inconsequential.” The due process harm is the conviction’s dependence on materially false evidence, not the prosecutor’s mental state. The opinion explicitly rejected the view (attributed to the concurrence) that prosecutorial knowledge is a prerequisite.

3.3. Impact

A. A new Hawaiʻi post-conviction pathway for “forensic field collapse” cases

The most significant practical impact is that defendants challenging convictions grounded in later-invalidated forensic feature-comparison testimony can proceed under a false evidence framework in HRPP Rule 40 proceedings, rather than the stricter McNulty regime. This lowers the petitioner’s burden from “probably change the result” to “reasonable possibility contributed.”

B. Expansion beyond hair to other microscopic comparison disciplines

Although the immediate dispute concerned hair and fiber, the court’s reasoning is broader: where authoritative scientific developments invalidate the discipline’s foundational claims (especially source attribution and reliability assertions without empirical grounding), Hawaiʻi courts may treat the resulting testimony as false evidence.

C. Doctrinal recalibration of earlier Hawaiʻi assumptions

By acknowledging that State v. Fukusaku reflected an older consensus that no longer holds, the opinion implicitly signals that prior judicial comfort with certain forensic practices is revisitable when scientific consensus materially changes.

D. Incentives and institutional practice

The court framed its approach as promoting accurate convictions and encouraging responsible forensic use. By rejecting a knowledge prerequisite, the rule pressures the system to respond to evolving scientific reality rather than treating good-faith reliance on outdated forensic claims as a shield against constitutional correction.

4. Complex Concepts Simplified

  • HRPP Rule 40 vs. HRPP Rule 33: Rule 40 is Hawaiʻi’s post-conviction mechanism (often long after trial). Rule 33 concerns motions for new trial (typically closer in time). The court treated this case as a Rule 40 constitutional false-evidence problem, not a conventional “new trial based on new facts” problem.
  • “Newly discovered evidence” (McNulty): Think “new facts” (a new witness, a new document, new DNA results). The court said scientific consensus shifts are not new facts; they change the meaning/validity of what was said at trial.
  • “False evidence” and “materiality” (Stone/Birano): Relief is required if there is a “reasonable possibility” the false evidence contributed to conviction—i.e., it might have mattered to the jury’s decision, even if a reviewing court thinks other evidence was strong.
  • Class evidence vs. individualization: “Class” means a fiber/hair could come from many possible sources sharing characteristics; it cannot be tied to one unique source. “Individualization” is claiming it came from one specific source—something the reports say microscopic comparison cannot validly do.
  • Judicial notice (HRE Rule 201): A court may accept certain facts as established when they can be accurately determined from sources whose accuracy cannot reasonably be questioned—here, authoritative government-commissioned scientific reports, for limited purposes.

5. Conclusion

Granillo v. State establishes a clear Hawaiʻi rule for post-conviction litigation in the wake of discredited forensic sciences: when later scientific developments invalidate expert testimony used at trial, the claim is governed by the constitutional false-evidence standard—not the newly discovered evidence test. The court further held that fiber testimony premised on microscopic comparison can be false evidence where it exceeds scientific limits, and that prosecutorial knowledge is not required under article I, section 5 in this setting.

The decision’s significance lies in aligning due process doctrine with modern forensic science realities, ensuring that the passage of time does not insulate convictions obtained through scientifically invalidated expert assertions.