Background
In July 2022, the Director-General of Health issued directions to 14 local authorities requiring them to fluoridate drinking water supplies under powers granted by the Health Act 1956. The directions followed consultation and detailed written consideration of statutory criteria regarding scientific evidence and cost-benefit analysis. However, the letters and supporting materials made no express reference to the New Zealand Bill of Rights Act 1990, specifically the protected right to refuse medical treatment (s 11), which the Supreme Court had previously confirmed was engaged by fluoridation decisions.
New Health New Zealand Incorporated, an incorporated society opposing water fluoridation, challenged the directions through judicial review. The Supreme Court had previously held in New Health New Zealand Inc v South Taranaki District Council that water fluoridation constitutes medical treatment for Bill of Rights purposes, though two judges found it could be a justified limitation under s 5 of the Bill of Rights.
The High Court (Radich J) accepted New Health’s argument that an independent procedural obligation exists: the Director-General was required to turn his mind to whether the directions were a reasonable limit on the s 11 right, satisfy himself of that justification, and articulate this reasoning. The failure to do so rendered the decision unlawful, despite the substantive merits of fluoridation policy. The High Court ordered reconsideration while keeping directions in place. The Director-General subsequently published a Bill of Rights analysis in December 2024 and reconfirmed the directions.
The Court’s Holding
The Court of Appeal, sitting as a Full Court of five judges (French P, Courtney, Katz, Thomas JJ; Mallon J dissenting), allowed the Crown’s appeal and set aside the High Court’s finding of unlawfulness. The majority held that existing New Zealand law does not establish an independent, actionable procedural obligation requiring public decision-makers to conduct and articulate a Bill of Rights analysis as part of their decision-making process, even when protected rights are clearly engaged.
The Court confirmed that the Bill of Rights does impose a substantive constraint on administrative decisions—decisions must be rights-compliant and remain subject to judicial review through public law proceedings. When reviewing administrative action for compatibility with the Bill of Rights, courts may adopt a less structured approach than they do when assessing legislation, but this does not lower the threshold for justification under s 5. The Court emphasized that the substantive obligation to make rights-compliant decisions remains robust and enforceable.
However, the majority rejected the proposition that decision-makers commit an independent error of law by failing to explicitly address the Bill of Rights in their reasoning, provided the ultimate decision is substantively compliant with protected rights. The Court held the High Court’s reliance on earlier decisions by Cooke J and Television New Zealand Ltd v West was misplaced, as those decisions either addressed different contexts (where empowering statutes expressly required Bill of Rights consideration) or predated the full development of modern Bill of Rights jurisprudence. The majority concluded existing authority did not evidence consensus for the procedural duty and declined to recognize it as a novel development.
Key Takeaways
- No independent procedural obligation exists under New Zealand law requiring public decision-makers to undertake and articulate a Bill of Rights assessment when protected rights are engaged, even for decisions with significant rights implications.
- The substantive constraint remains enforceable: administrative decisions must be compatible with the Bill of Rights, assessed through public law proceedings with courts applying a robust proportionality test sensitive to the administrative context.
- Explicit reference to the Bill of Rights in decision-making reasons is not required; substantive compliance is the governing standard.
- Courts may adopt a less structured approach when assessing administrative decisions for s 5 justification than when assessing primary legislation, while maintaining rigorous scrutiny.
Why It Matters
This decision fundamentally shapes the landscape of administrative law and human rights protection in New Zealand. It establishes that the Bill of Rights operates primarily as a substantive constraint on administrative action, enforceable through judicial review, rather than imposing detailed procedural requirements on how decision-makers must reason internally. This distinction has significant practical implications: public sector agencies need not formally document Bill of Rights analysis in their reasoning, reducing administrative burden, but their decisions remain vulnerable to judicial challenge if substantively non-compliant with protected rights.
The decision reflects tensions between judicial protection of human rights and respect for administrative discretion and efficiency. The majority’s approach assumes substantive review provides adequate protection, trusting that executive culture and constitutional norms will encourage rights-respecting decision-making even without explicit procedural mandates. For practitioners advising public sector clients, the judgment clarifies that while Bill of Rights analysis need not be formal or articulated, the substantive outcome remains scrutinizable and must withstand proportionality review if rights are engaged. The Court’s allowance of the appeal despite the Crown’s voluntary reconsideration suggests confidence that substantive constraints are sufficient safeguards.