Nonparty Fault Under HRS § 663-10.5 Requires Notice, Individualized Proof, and Findings

1. Introduction

R.H. v. Hayashi establishes important procedural limits on the allocation of fault to nonparties when a government defendant invokes Hawaiʻi Revised Statutes (“HRS”) § 663-10.5. Although that statute generally limits governmental liability to the government’s proportionate responsibility, it does not authorize an unrequested, inadequately supported reduction of a plaintiff’s recovery. Nonparty apportionment is an affirmative defense that must be meaningfully pleaded, proved, and litigated consistently with the Hawaiʻi Constitution’s guarantee of due process.

The litigation arose from repeated sexual abuse of A.H., identified in the opinion by the pseudonym “Amy,” while she attended McKinley High School. Amy had severe cognitive disabilities, functioned far below her chronological age, and lacked the capacity to consent to sexual activity. School personnel knew about her disabilities and vulnerability, received repeated warnings of sexual exploitation, and nevertheless failed to provide adequate protection. Amy eventually suffered a catastrophic psychotic breakdown and persistent post-traumatic stress disorder (“PTSD”).

Amy’s mother, R.H., sued individually and as Amy’s guardian ad litem. The defendants included the State of Hawaiʻi, its Department of Education (“DOE”), the superintendent in his official capacity, and DOE employees. Lanakila Pacific also appeared in the caption, although the appellate issues addressed in the opinion centered on the State defendants.

Following a sixty-six-day bench trial, the circuit court found the State negligent and assessed total damages of $14,167,354.81. It then independently allocated 30% of the fault to the male students who had sexually abused Amy, reducing the judgment by $4,250,206.44. The State had generally pleaded § 663-10.5 but had never pursued apportionment to those students. Its specific apportionment argument instead targeted Mother, an argument the circuit court rejected.

The resulting appeal presented three connected questions: whether the plaintiffs received constitutionally adequate notice of nonparty apportionment; whether the students had been proved to be legally liable “other tortfeasors”; and which party bore the burden of establishing the defense. The State’s cross-appeal separately challenged restrictions on Amy’s deposition, denial of a requested medical examination, and the damages award.

2. Summary of the Opinion

The Supreme Court ruled for the plaintiffs on the apportionment issues and rejected the State’s cross-appeal.

• Due process: The circuit court’s sua sponte allocation deprived the plaintiffs of notice and a meaningful opportunity to contest the students’ legal liability and alleged percentages of fault.
• Insufficient proof: The circuit court did not establish that any particular student committed an actionable tort against Amy or determine that student’s individual share of responsibility.
• Affirmative defense: A government defendant seeking reduced liability based on a nonparty’s fault under HRS § 663-10.5 must plead and prove that defense. The State’s general statutory reference did not satisfy its obligations concerning these students.
• Waiver: Because the State did not pursue or prove student-based apportionment, it waived that argument. The circuit court should have granted the plaintiffs’ motion to amend the judgment.
• Discovery: The circuit court permissibly limited further questioning and denied the requested examination because specific medical evidence demonstrated substantial psychological danger and little likely informational benefit.
• Damages: The award was supported by the evidence and was not excessive.

The court vacated the judgment only insofar as it allocated 30% of the fault to nonparties and reduced the plaintiffs’ damages. It remanded for an amended judgment awarding the entire $14,167,354.81 and affirmed in all other respects. The remand was not an invitation to reopen the State’s abandoned apportionment theory.

3. Analysis: Precedents Cited

A. Appellate Review and Statutory Interpretation

Klink v. State, 113 Hawaiʻi 332, 152 P.3d 504 (2007), supplied the clearly erroneous standard for reviewing factual findings. A finding fails that standard if substantial evidence is absent or the appellate court remains firmly convinced that a mistake occurred. Its definition of substantial evidence—credible evidence of sufficient quality and probative value—was particularly relevant to the unsupported determination that the students qualified as tortfeasors.

State v. Levi, 102 Hawaiʻi 282, 75 P.3d 1173 (2003), and Dan v. State, 76 Hawaiʻi 423, 879 P.2d 528 (1994), established independent appellate review of legal conclusions. These authorities allowed the Supreme Court to assess statutory meaning and constitutional requirements without deferring to the circuit court’s legal understanding of § 663-10.5.

Peterson v. Haw. Elec. Light Co., 85 Hawaiʻi 322, 944 P.2d 1265 (1997), provided the starting point for statutory interpretation: the statutory language and its plain meaning. The opinion expressly noted that this precedent had been superseded on other grounds. Citizens Against Reckless Dev. v. Zoning Bd. of Appeals, 114 Hawaiʻi 184, 159 P.3d 143 (2007), explained that ambiguity permits examination of context, legislative history, and statutory purpose. Together, these cases supported consideration of both § 663-10.5’s conditional wording and its objective of protecting government entities against disproportionate liability.

B. Nonparty Apportionment and the Limits of Existing Contribution Cases

In Gump v. Wal-Mart Stores, Inc., 93 Hawaiʻi 417, 5 P.3d 407 (2000), a plaintiff sued Wal-Mart and McDonald’s after slipping on a French fry, then settled with and dismissed McDonald’s. Wal-Mart had not cross-claimed against McDonald’s but sought its inclusion on the special verdict form. The court recognized that nonparties could sometimes be considered joint tortfeasors under the Uniform Contribution Among Tortfeasors Act (“UCATA”), yet rejected inclusion under the circumstances. A defendant’s tactical decision not to pursue a cross-claim could carry adverse consequences.

Moyle v. Y & Y Hyup Shin Corp., 118 Hawaiʻi 385, 191 P.3d 1062 (2008), narrowed the apparent discretion described in Gump v. Wal-Mart Stores, Inc.. There, defendants unsuccessfully attempted to implead an assailant four months before trial, but the assailant nevertheless appeared on the verdict form and received 95% of the fault. The Supreme Court held that “appropriate circumstances” for including nonparties were limited, identifying examples involving jurisdictional dismissal, a continuing bankruptcy stay, or a settlement release permitting inclusion.

Importantly, Moyle v. Y & Y Hyup Shin Corp. distinguished evidence of a nonparty’s conduct from a legal allocation of fault to that person. Conduct may be relevant to causation or the defendant’s liability without justifying a reduction of the plaintiff’s recovery through nonparty apportionment. That distinction directly addressed the problem here: evidence describing the students’ conduct did not itself establish a properly litigated apportionment defense.

The court carefully limited the force of these UCATA decisions. HRS § 663-10.5 operates notwithstanding contrary law and independently eliminates joint and several liability for government entities in the relevant circumstances. Consequently, the UCATA pleading rules did not automatically control. Nevertheless, the cases’ underlying insistence on orderly litigation and resistance to “eleventh hour” fault allocation informed the court’s constitutional analysis.

Doe Parents No. 1 v. State, Dep't of Educ., 100 Hawaiʻi 34, 58 P.3d 545 (2002), supplied the central distinction between causing harm and qualifying as a legally liable tortfeasor. Under its formulation, the injured person must have been able to recover damages in a direct action against the proposed tortfeasor. A defendant dismissed with prejudice could not be treated as an “other tortfeasor” under the UCATA provision considered there. In the present opinion, that direct-action principle supported requiring proof of actionable legal liability, rather than merely evidence that someone participated in events leading to injury.

The State also relied on Cummings v. State, an unpublished 2006 summary disposition order, for the proposition that § 663-10.5 does not require a claim against another tortfeasor. The court rejected that reliance because Hawaiʻi Rules of Appellate Procedure Rule 35(c)(1) prohibited citation of the pre-July 2008 disposition absent an applicable exception. No exception applied. The decision therefore treated this citation as improper, not as usable substantive authority.

C. Constitutional Protection of the Claim and Damages Award

Brown v. Thompson, 91 Hawaiʻi 1, 979 P.2d 586 (1999), supplied the due process framework. Courts first determine whether a protected property interest exists and then identify the procedures necessary to protect it. Due process is flexible, but its basic requirements remain notice and an opportunity to be heard at a meaningful time and in a meaningful manner.

The court also drew from Brown v. Thompson a balancing approach considering the affected private interest, the risk of erroneous deprivation and value of additional safeguards, and the governmental interest and procedural burden. Applied here, those factors strongly favored advance identification and litigation of any proposed nonparty allocation.

Logan v. Zimmerman Brush Co., 455 U.S. 422 (1982), recognized that a state-law cause of action can constitute protected property under federal due process. The opinion also cited Martinez v. California, 444 U.S. 277 (1980), through that discussion, for recognition of a state tort claim as a species of protected property. These authorities supported the Hawaiʻi court’s express holding that both the plaintiffs’ cause of action and their damages award were protected under Article I, Section 5 of the Hawaiʻi Constitution.

D. Affirmative Defenses and the Burden of Proof

Touche Ross, Ltd. v. Filipek, 7 Haw. App. 473, 778 P.2d 721 (1989), confirmed that HRCP Rule 8(c)’s list of affirmative defenses is not exhaustive. Matters constituting an avoidance must also be pleaded affirmatively. This prevented the State from treating the absence of an express reference to § 663-10.5 in Rule 8(c) as decisive.

Bhakta v. Cnty. of Maui, 109 Hawaiʻi 198, 124 P.3d 943 (2005), described an affirmative defense as one defeating or barring an otherwise valid claim. The present opinion explained that the category also includes defenses producing only partial reductions. Payment and comparative negligence illustrate why a liability limitation can remain an affirmative defense even when it does not eliminate recovery entirely.

Hardin v. Manitowoc-Forsythe Corp., 691 F.2d 449 (10th Cir. 1982), treated the contention that a “phantom party” contributed to injury as an avoidance ordinarily requiring affirmative pleading. Its emphasis on Rule 8(c)’s notice function was influential: plaintiffs must know sufficiently before trial that defendants intend to present such a defense.

McGraw v. Sanders Co. Plumbing & Heating, Inc., 667 P.2d 289 (Kan. 1983), placed a defendant attributing fault to another person in the same burden-bearing position as one alleging the plaintiff’s negligence. The defendant must plead and prove the asserted fault. Its express allocation of the proof burden reinforced the conclusion that a plaintiff should not have to disprove the liability of unidentified outsiders.

Nash v. Wells Fargo Guard Serv.'s, Inc., 678 So. 2d 1262 (Fla. 1996), required affirmative pleading of nonparty negligence, specific identification of the nonparty, and trial evidence that the nonparty’s fault contributed to the accident. Its recognition that notice affects presentation of the case and evidentiary rulings helped explain why a general statutory reference was inadequate here.

Hawaiʻi authorities supplied the same general allocation of responsibility. State ex rel. Shikada v. Bristol-Myers Squibb Co., 152 Hawaiʻi 418, 526 P.3d 395 (2023), placed the burden of proving accord and satisfaction on the party asserting that affirmative defense. U.S. Bank Nat'l Ass'n v. Castro, 131 Hawaiʻi 28, 313 P.3d 717 (2013), confirmed that plaintiffs generally need not disprove affirmative defenses.

Finally, Collins v. Greenstein, 61 Haw. 26, 595 P.2d 275 (1979), quoted Restatement (Second) of Torts § 433B(2): when multiple actors’ tortious conduct combines to cause harm, an actor seeking to limit liability through apportionment bears the apportionment burden. The court acknowledged that this statement appeared in a footnote, but found it consistent with the broader rule governing affirmative defenses.

E. Discovery Discretion and Protection Against Serious Harm

Appeal of Goodfader, 45 Haw. 317, 367 P.2d 472 (1961), supplied both sides of the discovery balance. Discovery receives broad and liberal treatment, but trial courts possess considerable discretion and may consider the effect questioning will have on the person examined. Its quotation from Hickman v. Taylor, 329 U.S. 495 (1947), emphasized that discovery has “ultimate and necessary boundaries.”

Kealoha v. Cnty. of Haw., 74 Haw. 308, 844 P.2d 670 (1993), established that reversal requires the trial court to exceed the bounds of reason or disregard governing principles to a litigant’s substantial detriment. State v. Rabe, 5 Haw. App. 251, 687 P.2d 554 (1984), illustrated the breadth of that discretion: different judges may reach opposing permissible rulings on the same facts. Birano v. State, 143 Hawaiʻi 163, 426 P.3d 387 (2018), provided clearly erroneous review for factual findings relevant to medical condition and discovery participation.

Kilakila ʻO Haleakala v. Bd. of Land & Nat. Res., 138 Hawaiʻi 383, 382 P.3d 195 (2016), reiterated trial courts’ considerable latitude over discovery. Brende v. Hara, 113 Hawaiʻi 424, 153 P.3d 1109 (2007), explained that HRCP Rule 26(c) is patterned after its federal counterpart and permits resort to parallel federal law when local authority is silent. Carvalho v. AIG Hawai'i Ins. Co., 150 Hawaiʻi 381, 502 P.3d 482 (2022), likewise recognized the persuasive force of federal interpretations of identical procedural rules. Those cases justified the court’s examination of outside authorities on medically dangerous depositions.

Salter v. Upjohn Co., 593 F.2d 649 (5th Cir. 1979), described complete prohibition of a deposition as unusual and ordinarily requiring extraordinary circumstances. Dunford v. Rolly Marine Serv. Co., 233 F.R.D. 635 (S.D. Fla. 2005), and In re McCorhill Publ'g, Inc., 91 B.R. 223 (Bankr. S.D.N.Y. 1988), illustrated sufficiently serious circumstances: documented medical conditions creating potentially life-threatening risks from questioning. These decisions underscored that prohibition requires a substantial showing, rather than ordinary discomfort.

Campos v. Webb Cnty., 288 F.R.D. 134 (S.D. Tex. 2012), recognized that severe psychological harm can also justify protection, while finding the showing there insufficient. It helped establish that psychological danger is legally relevant but must be medically substantiated.

Several authorities specified the required quality of proof. Anderson v. Cryovac, Inc., 805 F.2d 1 (1st Cir. 1986), demanded a particular factual demonstration of potential harm. Medlin v. Andrew, 113 F.R.D. 650 (M.D.N.C. 1987), required specific, documented evidence that questioning would endanger health. Schorr v. Briarwood Estates Ltd. P'ship, 178 F.R.D. 488 (N.D. Ohio 1998), accepted documentation from a PTSD expert. Estate of Chen v. Lingting Ye, 208 A.3d 1168 (R.I. 2019), rejected conclusory predictions unsupported by a particularized factual showing.

The court also drew an accommodation principle from these decisions. Schorr v. Briarwood Estates Ltd. P'ship permitted questioning under extensive conditions, while Estate of Chen v. Lingting Ye recognized authority to impose reasonable restrictions. Arcaris v. Superior Court, 160 Ariz. 533 (Ariz. Ct. App. 1989), approved protective arrangements for a child witness. Ceron v. Belilovsky, 92 A.D.3d 714 (2012), upheld prohibition of an oral deposition supported by expert evidence while allowing written interrogatories. Together, these authorities supported considering safer alternatives before prohibiting examination.

F. Rule 35 Examinations and Damages Review

Glover v. Grace Pac. Corp., 86 Hawaiʻi 154, 948 P.2d 575 (App. 1997), required an examination movant to adequately demonstrate that the condition was “in controversy” and that “good cause” existed. Schlagenhauf v. Holder, 379 U.S. 104 (1964), emphasized that those requirements demand an affirmative showing, not merely conclusory allegations or relevance. The present court found both requirements satisfied, but explained that they authorize rather than compel an examination.

Kang v. Harrington, 59 Haw. 652, 587 P.2d 285 (1978), established deference to the factfinder’s damages assessment, including in bench trials. The question is whether reasonable people could reach the same result on the evidence. Kekona v. Bornemann, 135 Hawaiʻi 254, 349 P.3d 361 (2015), reaffirmed that an award should stand unless palpably unsupported or so excessive and outrageous as to demonstrate legal error, passion, or prejudice. These standards foreclosed substituting the appellate court’s valuation for the circuit court’s supported assessment.

4. Analysis: Legal Reasoning

A. The Statute Protects Proportionate Liability, Not Unlitigated Allocations

HRS § 663-10.5 limits a government entity’s liability when it is determined to be a tortfeasor “along with one or more other tortfeasors.” The legislative history describes a concern that perceived governmental “deep pockets” could produce liability exceeding the government’s fair share.

The court did not reject that policy. Instead, it emphasized the statutory prerequisite: another legally liable tortfeasor must actually be established. A limitation on liability does not remove the need to identify the persons whose fault supplies the limitation, prove their liability, and determine their respective percentages of fault.

Nor did the statutory override of contrary law override constitutional protections. The court avoided mechanically importing UCATA’s joinder rules, but independently required fair procedures under the Hawaiʻi Constitution. This preserves the statute’s substantive benefit while preventing its application through surprise or unsupported assumptions.

B. Due Process Requires Four Minimum Safeguards

The plaintiffs possessed protected property interests in both their tort claim and their adjudicated recovery. Removing approximately $4.25 million therefore required constitutionally adequate procedures. The private interest was substantial, the risk of error was high without notice or a hearing, and advance litigation offered considerable corrective value.

The government’s interest also supported accurate procedures. Identifying proposed tortfeasors and litigating their responsibility could facilitate discovery and joinder, avoid later appeals, and improve public confidence without defeating the legislative goal of proportionate governmental liability.

The court prescribed four minimum protections:

1. Timely pleading notice: The pleadings, or a prompt amendment, must disclose an intention to allocate fault to an identified nonparty sufficiently before trial to permit meaningful discovery and, where appropriate, joinder.
2. Particularized identification: Each proposed nonparty must be identified sufficiently to permit assessment of legal liability to the plaintiff and qualification as an “other tortfeasor.”
3. Proof by the proponent: The party seeking apportionment must establish the legal and factual basis for each proposed allocation, including tortfeasor status and the percentage attributable to that person.
4. Supporting findings: Before reducing recovery, the trial court must find that each identified person qualifies as an “other tortfeasor” and determine that person’s percentage of fault.

These protections concern meaningful participation before the recovery is reduced. The availability of appellate review did not replace the missing trial-level process.

The court stopped short of requiring impleader in every case. It nevertheless directed courts to consider whether the circumstances warrant bringing nonparties into the action, particularly because a tortfeasor finding may harm their reputations. It also observed that, without an opportunity to litigate, the determination could not have res judicata effect against the nonparty.

C. The Students’ Involvement Did Not Establish Individual Legal Liability

The circuit court collectively classified “all persons” who sexually abused Amy as other tortfeasors and assigned them 30% of the fault. It did not determine whether any particular student had committed an actionable tort from which the plaintiffs could recover directly, or what share belonged to that student.

Its own findings further undermined the allocation. There was little or no evidence that the students knew details of Amy’s cognitive disabilities or knew, or should have known, that she lacked capacity to consent. The circuit court recognized a possible distinction concerning the student involved in the Ala Moana incident but did not develop that observation into an adequate individualized liability determination.

The Supreme Court’s conclusion was about insufficient proof in this record. It should not be read as establishing a universal rule that every civil claim arising from sexual abuse requires proof of knowledge of cognitive disability. The decisive defect was the absence of identified tort claims, supporting elements, and individualized findings sufficient to establish legal liability and fault percentages.

D. General Pleading Did Not Preserve the Particular Defense

The State’s answer invoked § 663-10.5, but its litigation conduct never developed a student-based apportionment defense. It did not identify the students as proposed other tortfeasors, seek percentages attributable to them, or present an apportionment theory directed to their respective responsibilities.

Indeed, its trial position generally denied that the alleged assaults had been proved or caused Amy’s injuries, and sometimes characterized encounters as consensual. Its specific request for a reduction concerned Mother’s alleged failure to disclose information to the school.

The plaintiffs were not obliged to anticipate and disprove every possible nonparty allocation merely because the State cited the statute. Treating their silence as a reason to supply the missing defense improperly shifted the State’s burden. A trial court cannot cure a defendant’s failure to pursue an affirmative defense by independently constructing and awarding it after trial.

Because the State failed to carry its pleading and proof obligations concerning the students, it waived that allocation. The resulting reduction also made denial of the plaintiffs’ HRCP Rule 59(e) motion to amend the judgment erroneous.

E. Serious Psychological Harm Can Justify Restricting a Deposition

The discovery holding balances broad access to relevant information against documented danger to a vulnerable witness. The court adopted a general framework requiring competent, specific, and documented evidence of a substantial risk of serious harm. General anxiety, conclusory medical opinions, and speculative predictions do not suffice.

Once that showing is made, the trial court should consider whether reasonable accommodations would adequately reduce the danger while preserving meaningful discovery. If accommodations are adequate, conditional questioning may proceed. If they cannot sufficiently mitigate the demonstrated risk, the court may limit or prohibit examination under HRCP Rule 26.

Amy’s circumstances satisfied that demanding framework. The circuit court initially permitted questioning at a child-friendly location, limited session length, authorized monitoring by the discovery master and therapist, and allowed termination if she became distressed. Despite those measures, two ninety-minute sessions caused significant deterioration, increased medication, and concern about renewed psychosis.

Treating professionals documented both actual harm and the likelihood of additional harm. A court-appointed neutral psychologist independently reviewed medical records and deposition recordings and evaluated Amy. Her reports explained that Amy’s disability prevented development of effective coping strategies and made significant improvement unlikely.

The likely benefit of more questioning was also limited by Amy’s suggestibility and difficulty providing reliable information. Other sources remained available; the State had not shown that it pursued direct testimony from the neighbor implicated in its alternative-causation theory or other less intrusive avenues. The record therefore supported the circuit court’s exercise of discretion, rather than an automatic discovery exemption based on disability.

F. Rule 35’s Threshold Requirements Do Not Create an Entitlement

The Supreme Court expressly found Amy’s psychological condition “in controversy” and found good cause for an examination. Nevertheless, HRCP Rule 35 states that the court may order an examination. Meeting its threshold requirements therefore leaves room for judicial assessment of safety and utility.

The requested examination involved eight hours of interviews and testing. The neutral expert concluded that further questioning and testing posed significant psychological risks and were unlikely to provide substantial additional information. The circuit court could deny the request on that record.

The State also failed to establish substantial prejudice. It possessed extensive medical records and reports, had questioned Amy in two deposition sessions, and did not identify otherwise unavailable information the proposed examination was likely to produce. The case thus does not eliminate adversarial medical examinations; it confirms that even a properly grounded request remains discretionary.

G. The Damages Reflected Supported Lifelong Needs

The circuit court credited evidence linking the abuse to Amy’s chronic PTSD, psychotic symptoms, and need for lifelong treatment and supervision. Her cognitive disabilities prevented her from benefiting from the principal available trauma therapy, intensifying the consequences and future care needs. Mother also developed major depressive and panic disorders associated with Amy’s abuse and illness.

The award rested on extensive testimony, medical evidence, and a life-care plan. Under deferential appellate review, its size alone did not establish excessiveness. Restoring the full award corrected an improper reduction; it did not add a new category of damages.

5. Potential Impact

A. More Precise Government Defense Practice

Government defendants can no longer rely on a bare reference to § 663-10.5 as sufficient notice of every potential nonparty allocation. Counsel seeking that relief must identify proposed tortfeasors early, articulate their legal liability, develop evidence of their individual responsibility, and request supported percentages of fault.

The opinion preserves governmental protection against disproportionate liability while making its application dependent on the ordinary discipline of pleading and proof.

B. Stronger Judicial Control of Nonparty Allocations

Trial courts must distinguish evidence relevant to causation from a properly presented apportionment defense. They should not independently reduce damages by attributing fault to unnamed groups without individualized liability findings and percentages.

The decision may also encourage earlier discovery, amendments, and appropriate joinder. Although impleader is not universally mandatory, reputational concerns and the circumstances of the proposed liability determination may make it appropriate in a particular case.

C. A Defined Framework for Vulnerable Witnesses

The deposition holding provides practical guidance beyond school-abuse litigation. Litigants asserting serious medical or psychological danger must offer particularized evidence, and courts should examine accommodations and alternative sources before prohibiting questioning.

Neutral evaluations, documentation of prior adverse reactions, and explanations of why protective measures cannot sufficiently reduce the risk are likely to become especially important. Disability or a PTSD diagnosis alone does not automatically resolve the inquiry.

D. Limited but Important Significance for School Liability

The affirmance underscores the legal significance of repeated warnings, known vulnerability, and failures to implement reasonable protection. However, the principal new rules concern apportionment and discovery. The opinion should not be characterized as creating an entirely new, universal school duty or a fixed damages benchmark for sexual-abuse cases.

6. Complex Concepts Simplified

Tortfeasor

A person legally responsible for a civil wrong. Participation in harmful events alone does not establish every element necessary for civil liability.

Joint and several liability

A system under which one responsible defendant may be required to pay the entire recoverable loss, subject to applicable rules. Section 663-10.5 generally protects government entities from that exposure in the circumstances it covers.

Apportionment

Allocation of responsibility among legally liable actors. Here, assigning a share to nonparties would reduce the amount collectible from the State.

Affirmative defense

A defense that defeats or reduces an otherwise valid claim. The defendant generally must raise it and prove the facts supporting it.

Sua sponte

Action taken by the court on its own initiative, rather than at a party’s request.

Procedural due process

Fair procedures before government action deprives someone of a protected interest, including meaningful notice and an opportunity to respond.

Impleader and joinder

Procedures for bringing additional persons into litigation. They may enable related liability questions to be resolved together.

Res judicata

Claim preclusion: the binding effect of a prior judgment on later litigation. The court explained that an unparticipating nonparty could not be bound by the tortfeasor determination without an opportunity to litigate.

Rule 35 examination

A court-authorized physical or mental examination when the condition is disputed and good cause exists. Those requirements permit an examination but do not compel one.

Special and general damages

Special damages compensate identifiable financial losses, such as medical and care expenses. General damages compensate nonfinancial injuries, including suffering and emotional distress.

7. Conclusion

R.H. v. Hayashi makes governmental nonparty apportionment a procedurally disciplined affirmative defense—not an automatic post-trial reduction. Timely notice, particularized identification, proof by the party seeking relief, and individualized findings are constitutionally required before a plaintiff’s recovery is diminished.

The opinion also confirms that discovery rights remain subject to documented risks of serious harm and reasonable judicial protection. Its ultimate disposition restored the plaintiffs’ full damages award while preserving both proportionate governmental liability and fair procedures for establishing it.