“Involved in a Collision” Under HRS § 291C-12(a) Includes Non-Contact Drivers (and Vagueness Challenges Are As-Applied Absent First Amendment Concerns)

Case: State v. Nahulu (Haw. July 2, 2026)
Court: Supreme Court of Hawaiʻi
Key holdings: (1) No facial vagueness standing for HRS § 291C-12(a) absent First Amendment implications; only an as-applied vagueness challenge is available. (2) “Involved in a collision” is not unconstitutionally vague as applied to an alleged police pursuit causing a crash even without physical contact. (3) Notice of the “nature and cause” may be satisfied by the charging instrument plus a bill of particulars clarifying the prosecution’s theory (including clarifying that the State does not rely on physical contact).

I. Introduction

Background. The case stems from a September 12, 2021 pursuit in Makaha involving Honolulu Police Department officers. A white Honda carrying young occupants crashed, rolled over, and ejected passengers, causing catastrophic injuries. Officer Joshua Nahulu allegedly drove the lead pursuit vehicle and was reportedly closest to the Honda at the time of the crash. None of the pursuing officers allegedly stopped to render aid; officers allegedly left, returned later, and acted as though unaware of what happened.

Charges and parties. Nahulu was charged under the “fled scene statute,” HRS § 291C-12(a), which requires the driver of any vehicle “involved in a collision” resulting in serious bodily injury or death to stop and remain at the scene until fulfilling HRS § 291C-14 duties (information exchange and reasonable assistance). Co-defendants faced hindering prosecution and conspiracy charges and joined Nahulu’s appeal.

Key issues. The appeal presented two constitutional questions: (1) whether “involved in a collision” is unconstitutionally vague (with defendants styling the challenge as facial); and (2) whether the felony information violated the Hawaiʻi Constitution’s notice requirement by not defining “involved in a collision,” especially where the State ultimately disclaimed reliance on vehicle-to-vehicle contact.

II. Summary of the Opinion

  • Standing / scope of vagueness review. Relying on State v. Alangcas and State v. Bates, the court held defendants lacked standing to mount a facial vagueness challenge because HRS § 291C-12(a) does not implicate free speech or substantial constitutionally protected conduct; only an as-applied challenge was available.
  • As-applied vagueness rejected. “Involved in a collision” is not unconstitutionally vague as applied to the alleged conduct—even under the State’s bill of particulars stating it was not relying on a physical-contact theory.
  • Notice satisfied via bill of particulars. Although the charging instrument tracked the statute and contained the elements, any uncertainty about the prosecution’s theory was cured by the bill of particulars ordered by the circuit court, which clarified the State’s non-contact theory.
  • Disposition. The Supreme Court affirmed the circuit court’s denial of the motions to dismiss.
Notable dicta. The court suggested the legislature “may wish to codify a definition” clarifying that a driver is “involved in a collision” if “actively involved in the events immediately leading to the collision” in a “logical and substantial” way.

III. Analysis

A. Precedents Cited

1. Vagueness doctrine, standing, and method of review

  • State v. Alangcas. This case supplied the controlling framework: absent First Amendment concerns, a defendant may challenge a statute for vagueness only “as applied” to the defendant’s conduct. Alangcas also articulated the two core vagueness inquiries (ordinary understanding; avoidance of ad hoc enforcement) and the requirement that the challenger show vagueness as applied.
  • State v. Bates. Cited through Alangcas for the standing limitation on facial vagueness challenges in non-First Amendment contexts.
  • State v. Pacquing. Used for the baseline definition of unconstitutional vagueness (lack of definitional clarity and risk of arbitrary enforcement) and the proposition that criminal statutes receive stricter vagueness scrutiny than civil statutes.

2. Statutory interpretation constraints (lenity and context)

  • State v. Bayly and State v. Shimabukuro. These cases anchored the court’s acknowledgment of the rule of lenity—ambiguities in criminal statutes are construed narrowly against the government.
  • State v. Gaylord. Tempered lenity with the court’s insistence that penal statutes are still interpreted with “precedent, legislative history, and common sense” to avoid wooden or absurd readings.

3. Hawaiʻi’s own “fled scene” construction

  • State v. Chen. This was the central Hawaiʻi interpretive precedent on “involved” under HRS § 291C-12(a). The ICA held “‘[i]nvolved’ can be commonly understood to include the status of ‘being affected or implicated.’” Although Chen involved an actual collision between vehicles (and thus did not decide a pure no-contact scenario), it strongly supported an expansive conception aligned with the Uniform Vehicle Code.
  • State v. Liuafi. Cited via Chen for the purpose of the duty to render aid: providing prompt assistance to minimize injuries.
  • Wylie v. State. Cited via Chen for the broader purpose of stop-and-render-aid statutes: protecting injured persons and facilitating civil and criminal liability determinations.

4. Sister-state authority addressing no-contact “involved in”

The court reinforced that most jurisdictions interpreting Uniform Vehicle Code-style language hold “involved in” does not require physical impact by the defendant’s vehicle, and that such statutes are not unconstitutionally vague.

  • Evans v. Commonwealth and Robinson v. Commonwealth. Provided a workable test: a driver is “involved” if there is physical contact or if the driver is a “proximate cause” of the accident. Evans (a pursuit case) illustrated “involved” without contact where the defendant’s conduct proximately caused the crash.
  • Clancy v. State. Cited for rejecting a physical-impact requirement and for holding “involved”/“accident” language provides fair notice and does not encourage discriminatory enforcement.
  • People v. Bammes. Emphasized common-sense notice: a reasonable driver whose actions contributed to an immediately subsequent accident would understand they were involved, supporting rejection of vagueness claims.
  • State v. McClain and Gaulden v. State. Addressed statutory wording changes similar to Hawaiʻi’s 2021 “accident”→“collision” amendment. McClain suggested that swapping “accident” for “crash” does not necessarily create ambiguity or narrow coverage. Gaulden was distinguished because Florida’s legislature was found to have intended narrowing, whereas Hawaiʻi’s legislative record reflected a terminology-modernization purpose, not a contraction of scope.
  • Additional categories (racing/drag racing; evasive action) were supported by: State v. Hughes, People v. Brady, State v. Foster, State v. Sene, Comstock v. State, State v. Simpson, Steen v. State, and State v. Perebeynos.

5. Notice and charging-instrument doctrine

  • State v. Kauhane. Set out the modern test for timely challenges to charges: the charge must contain the elements and sufficiently apprise the defendant of what must be met.
  • State v. Merino. Provided the general sufficiency formulation (elements + adequate notice of what to meet).
  • State v. Wheeler. Reinforced that missing elements—including attendant circumstance elements—render a charge deficient, and limited what post-objection materials may be considered for notice.
  • State v. Kaakimaka. Emphasized that even when elements are present, the charge must still sufficiently apprise the defendant of what must be prepared to meet.
  • State v. Israel. Supported considering “all of the information supplied” when assessing whether the “nature and cause” notice right was satisfied.

B. Legal Reasoning

1. Why the court rejected a facial vagueness challenge

The court’s standing analysis is the gateway holding. Under State v. Alangcas, facial vagueness review is generally reserved for statutes reaching substantial constitutionally protected conduct (classically, speech). Because HRS § 291C-12(a) regulates post-collision duties rather than expressive activity, and because it plainly applies in at least a “core” scenario (where a driver’s vehicle physically collides), the statute is not facially void. That “plainly constitutional in some applications” feature foreclosed a facial vagueness attack and confined review to whether the statute gave adequate notice as applied to Nahulu’s alleged conduct.

2. “Involved in a collision” reaches non-contact conduct (as applied)

The court’s as-applied analysis blended three tools—legislative history, precedent, and “common sense”—to conclude that a pursuit driver can be “involved” without impact.

(a) Legislative history did the heaviest lift

The court traced Hawaiʻi’s evolution:

  • Pre-1971 law. Hawaiʻi’s earlier fled-scene statute focused on drivers who had actually “struck” a person/vehicle (narrow physical-contact paradigm).
  • 1971 adoption of the Uniform Vehicle Code. Hawaiʻi adopted UVC § 10-102(a) verbatim, intentionally expanding coverage to any driver “involved” in an accident “even though there is no collision or striking of another vehicle or person.” This was presented as a uniformity and highway-safety modernization project.
  • 2021 amendment (“accident” → “collision”). The court read 2021 Haw. Sess. Law Act 125 as a terminology update recognizing preventability/causation and enabling charging alongside negligent injury/homicide—not a decision to narrow the UVC-derived breadth. This legislative purpose allowed the court to maintain continuity: the word change did not reimpose a physical-impact requirement.
(b) Hawaiʻi precedent set the semantic direction; sister-state cases filled the no-contact gap

State v. Chen supplied an interpretive baseline (“affected or implicated”) and explicitly noted the UVC’s expansive intent, even though it declined to “forecast” pure no-contact scenarios. The court then used a broad survey of other jurisdictions—particularly pursuit and proximate-cause cases like Evans v. Commonwealth and Robinson v. Commonwealth—to confirm that “involved in” commonly includes a proximate-cause relationship, not just impact.

(c) Common sense and statutory purpose

The court emphasized the protective purpose of the duty to stop and render aid. In the specific context alleged—police pursuit culminating in severe injury—the court held it is “common sense” that the law requires stopping to render aid, especially for an officer. This “purpose-informed common sense” was used to confirm that the statute, as applied, provides adequate notice and does not invite arbitrary enforcement.

3. Notice: the charge plus bill of particulars satisfied Article I, Section 14

The court separated two ideas: (1) whether the information contained all elements (it did), and (2) whether the defense had fair notice of what theory it must meet.

  • The circuit court recognized factual conflict about possible contact and ordered a bill of particulars.
  • The State’s bill of particulars clarified it was not relying on a contact theory. The Supreme Court treated that clarification as sufficient to inform Nahulu what he needed to defend against: being “involved in a collision” through non-contact involvement connected to the collision.

The practical upshot is procedural: where statutory language is broad, a bill of particulars can be the mechanism that turns broad charging language into constitutionally adequate notice of the prosecution’s specific theory.

C. Impact

1. Substantive reach of HRS § 291C-12(a) expands (or is confirmed as expansive) post-2021

The decision effectively cements that “involved in a collision” is not limited to physical contact, despite the 2021 “accident”→“collision” amendment. This is especially consequential for:

  • Pursuit cases (including police pursuits), where causation rather than impact may tie the pursuing vehicle to the collision.
  • Racing/drag racing scenarios where a participant’s conduct contributes to a crash even if their vehicle never touches another.
  • Evasive-action cases where a driver’s unsafe maneuver causes another road user to crash while avoiding contact.

2. Vagueness challenges in Hawaiʻi: reaffirmed limits and litigation posture

By reaffirming State v. Alangcas, the court signals that most vagueness challenges to ordinary criminal statutes will be confined to as-applied arguments unless speech-related rights are implicated. Future litigants will need to build records focused on the application to specific conduct (e.g., what a person in the defendant’s position knew, observed, or reasonably should have understood).

3. Charging practice: prosecutors may rely on bills of particulars for theory clarification

The court’s notice holding encourages a two-step approach: plead statutory elements in the information, then use a bill of particulars (when ordered or strategically offered) to specify the theory of “involvement” (contact, pursuit/causation, aiding/abetting-like involvement, etc.). Defense counsel should expect, and seek, early theory pin-down where “involved” could be contested.

4. Legislative invitation

The court’s closing suggestion invites codification of a causation-and-connection definition (e.g., “logical and substantial” connection to events immediately leading to the collision). If adopted, that could reduce future vagueness litigation and standardize jury instructions, but it could also become a new battleground over how “substantial” the connection must be.

IV. Complex Concepts Simplified

  • Facial vs. as-applied vagueness. A facial challenge argues a law is invalid in all (or nearly all) applications. An as-applied challenge argues the law is unclear when applied to the defendant’s particular conduct. Under State v. Alangcas, facial vagueness is usually unavailable unless the law implicates expressive or similarly protected constitutional activity.
  • Void for vagueness (two core concerns). A law is unconstitutionally vague if ordinary people cannot understand what it prohibits, or if it gives police/prosecutors too much discretion to enforce it arbitrarily.
  • Rule of lenity. If a criminal statute is genuinely ambiguous, courts construe it narrowly in favor of the defendant (State v. Bayly; State v. Shimabukuro). Here, the court concluded that legislative history and UVC lineage resolved the ambiguity in favor of breadth.
  • “Involved in a collision.” The court treats “involved” as broader than “hit” or “collided with.” It can include being “affected or implicated” (State v. Chen) and, in many jurisdictions, being a proximate cause of the collision (Evans v. Commonwealth; Robinson v. Commonwealth).
  • Proximate cause (in this context). A common legal way of asking whether someone’s conduct is sufficiently connected to an outcome to justify responsibility—more than a trivial link, but not necessarily the only cause.
  • Bill of particulars. A court-ordered document requiring the State to specify the factual theory supporting a charge. It does not replace the charging instrument’s elements; it clarifies what conduct the defendant must be ready to defend against and helps prevent surprise at trial.

V. Conclusion

State v. Nahulu delivers a clarifying—and practically significant—interpretation of Hawaiʻi’s fled scene statute after the legislature’s “accident”→“collision” terminology change. The Supreme Court held defendants cannot mount a facial vagueness challenge to HRS § 291C-12(a) absent First Amendment implications, and it confirmed that “involved in a collision” can encompass non-contact conduct, including alleged pursuit-related involvement. Procedurally, the decision underscores that constitutional notice can be satisfied by the elements-based charge supplemented by a bill of particulars that specifies the prosecution’s theory (here, explicitly disavowing physical contact). The opinion both solidifies broader accountability for collision scenes and signals a path for legislative codification to further reduce uncertainty.