Background
In October 2019, Tyson Repia and a female complainant were both inpatients at the same mental health unit when a nurse discovered Repia on top of the complainant. Repia was charged with three counts of sexual violation — one by rape and two by unlawful sexual connection. It was not in dispute that intentional penetration occurred and that the complainant did not consent. The contested element was the third ingredient of sexual violation under s 128 of the Crimes Act 1961: whether Repia lacked reasonable grounds to believe the complainant was consenting.
In August 2020, Repia was found unfit to stand trial. Expert evidence established he suffered from severe, treatment-resistant schizophrenia marked by auditory hallucinations, persecutory and grandiose delusions, and disorganised thought processes that precluded meaningful participation in a trial. Under s 10(1) of the Criminal Procedure (Mentally Impaired Persons) Act 2003 (CPMIP Act), a fitness finding triggers a mandatory “involvement hearing” before any protective disposition can be ordered. At that hearing, the court must decide on the balance of probabilities whether the evidence is sufficient to establish that the defendant “caused the act or omission that forms the basis of the offence.”
The involvement hearing took place in 2021. The District Court, and on successive appeals the High Court and Court of Appeal, all held that the s 10(2) inquiry did not require the Crown to prove absence of reasonable belief in consent. The Court of Appeal characterised the inquiry as confined to the actus reus and mental elements integral to it, or defences such as mistake or self-defence where objective evidence existed — but not the defendant’s subjective reasonable belief in consent. Repia was granted leave to appeal to the Supreme Court on whether that approach was correct.
The Court’s Holding
The Supreme Court unanimously dismissed the appeal, though the five justices produced three sets of reasons. The majority (Ellen France, Kós and Miller JJ, reasons given by Kós J) rejected both extreme positions advanced by the parties. The text of s 10(2) does not confine the involvement inquiry to purely physical elements, but equally it does not demand proof of every element of the offence — had Parliament intended that, the CPMIP Act would simply have required proof that the defendant “committed the offence.” The majority held that the involvement hearing may extend to mental elements integral to the injurious act, or to the disproof of a defence (such as mistake, accident or self-defence) where an objective evidentiary foundation has been laid. The essential purpose of s 10(2) is to ensure that those who cannot reasonably be subjected to the compulsory therapeutic regime are excluded from it before disposition — not to replicate a criminal trial at a lower standard of proof.
Applying that framework to sexual violation, the majority concluded that absence of reasonable belief in consent is neither integral to the injurious act of non-consensual penetration nor raised as a defence with sufficient objective foundation on the facts of this case. The involvement inquiry was therefore satisfied by the uncontested evidence of intentional penetration and the complainant’s non-consent. Winkelmann CJ and Glazebrook J each wrote separately, reaching the same result while articulating different views on the precise boundary between actus reus and mens rea elements under s 10(2).
The Court also addressed the Bill of Rights dimensions, acknowledging that s 25 minimum rights — including the right to a fair hearing, the presumption of innocence, and the right to present a defence — as well as the right to freedom from discrimination on grounds of mental impairment under s 19(1) and the Convention on the Rights of Persons with Disabilities, bear on the construction of s 10(2). Those rights inform the interpretive exercise but did not, in the majority’s view, compel the inclusion of reasonable belief in consent in the s 10(2) inquiry on the facts presented.
Key Takeaways
- The s 10(2) CPMIP Act involvement hearing occupies a middle ground: it goes further than bare proof of physical acts, but does not require the Crown to prove every element of the offence charged.
- Mental elements may fall within the s 10(2) inquiry where they are integral to the injurious act itself, or where objective evidence raises a defence (such as mistake or self-defence) that must be addressed.
- For sexual violation, absence of the defendant’s reasonable belief in consent is not required to be established at an involvement hearing; proof of non-consensual intentional penetration suffices.
- Bill of Rights and international disability-rights norms shape the construction of s 10(2) but do not, on the majority’s reasoning, extend the inquiry to cover the defendant’s subjective belief on the facts here.
- The case follows and applies the approach to involvement hearings recently articulated in Bailey v R [2026] NZSC 20.
Why It Matters
This decision provides the most authoritative guidance to date on the scope of involvement hearings for defendants found unfit to stand trial — a threshold inquiry that determines whether someone can be subjected to compulsory detention and treatment without ever being convicted. By declining to confine the inquiry to a pure actus reus test, yet also refusing to treat the hearing as a surrogate trial requiring proof of all offence elements, the Supreme Court has defined a contextual, purpose-driven standard that courts must apply case by case. The result will affect how prosecutors and defence counsel approach involvement hearings across a range of serious offences where defendants have significant mental impairments.
For sexual violation cases specifically, the ruling settles a contested question: the Crown need not prove the absence of reasonable belief in consent at the involvement stage. This has practical implications for unfit defendants whose severe psychiatric conditions may make any inquiry into their subjective beliefs at the time of the alleged offending particularly difficult. At the same time, the majority’s recognition that Bill of Rights and disability-rights norms are live considerations leaves open the possibility that, in future cases with different evidentiary foundations, those rights may play a more decisive role in shaping what the involvement inquiry must address.