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Costello v The Government of Ireland, Ireland and the Attorney General (Approved)
Factual and Procedural Background
The Appellant, a member of the national legislature, instituted proceedings seeking to prevent the State from ratifying the Comprehensive Economic and Trade Agreement (“CETA”) between Canada and the European Union and its Member States. He alleged that ratification would breach the Irish Constitution, particularly Articles concerning the exclusive legislative power of the Oireachtas and the administration of justice by the courts. The High Court dismissed the action. A direct leap-frog appeal was taken to the Supreme Court, which delivered a lengthy judgment addressing both the substantive constitutional questions and the exceptional procedural posture of being asked to rule on an evolving international treaty.
Legal Issues Presented
- Whether ratification of CETA would violate Article 15.2.1 of the Constitution by creating a “legislative chill” that undermines the exclusive law-making authority of the Oireachtas.
- Whether the dispute-resolution mechanisms in Chapter 8 of CETA would constitute an impermissible “administration of justice” by a body other than the constitutionally established courts, contrary to Article 34.
- Whether any other provisions of CETA effect an unconstitutional transfer of sovereignty requiring approval by referendum under Article 46.
- If incompatibility is established, whether the defect can be remedied by ordinary legislation (e.g. amending the Arbitration Act 2010) or only by constitutional amendment.
Arguments of the Parties
Appellant's Arguments
- CETA’s investor–state dispute settlement (“ISDS”) system allows Canadian investors to bypass Irish courts, thereby derogating from Article 34.
- The prospect of substantial arbitral awards would deter the Oireachtas from legislating in sensitive areas (notably environmental protection), infringing Article 15.2.1.
- Consent to ISDS is “irrevocable for many years”, amounting to an ongoing surrender of sovereignty that cannot be effected without a referendum.
- CETA awards would be enforceable in Ireland via the Arbitration Act 2010, effectively giving supranational tribunals domestic effect and undermining Article 29.3 (sovereign immunity).
Respondent's Arguments
- CETA is an instrument of public international law with no direct effect in domestic law; Article 30.6 expressly precludes conferring rights on individuals.
- The Tribunal would apply international law, not Irish law, and could not invalidate Irish legislation; therefore Articles 15 and 34 are not engaged.
- An investor must abandon domestic proceedings before commencing a CETA claim, so no Irish court jurisdiction is “taken away.”
- Enforcement through the Arbitration Act 2010 is constitutionally permissible and consistent with dualism recognised in McD v. L.
Table of Precedents Cited
| Precedent | Rule or Principle Cited For | Application by the Court |
|---|---|---|
| In re Article 26 and the Emergency Powers Bill 1976 | Probability, not mere possibility, of constitutional conflict is required to strike down legislation | Used as benchmark for assessing speculative “legislative chill” claims |
| McNally v. Ireland (2011) | Standing and prematurity in constitutional claims | Illustrated courts’ reluctance to decide hypothetical disputes |
| Blythe v. Attorney General (1936) | Discretion to refuse declaratory relief where issues are speculative | Cited to question appropriateness of declarations sought |
| McDonald v. Bord na gCon (1965) | Five indicia of “administration of justice” | Framework for analysing whether CETA tribunals exercise judicial power |
| Zalewski v. WRC (2021) | Modern application of McDonald criteria | Referenced to underscore breadth of Article 34 protections |
| Crotty v. An Taoiseach (1987) | Limits of treaty-making where sovereignty is transferred | Contrasted with present case; CETA found distinguishable |
| Pringle v. Ireland (2013) | Clear, concrete treaty obligations vs. speculative ones | Used to show CETA’s fluidity makes challenge premature |
| The State (Gilliland) v. Governor of Mountjoy Prison (1987) | Treaties with budgetary implications require Dáil approval | Acknowledged but held not determinative of constitutionality |
| Micula v. Romania (UKSC 2020) | Enforcement scope of ICSID awards | Illustrated potential, though remote, conflict with domestic judgments |
| Slowakische Republik v. Achmea BV (CJEU 2018) | ISDS clauses incompatible with EU law autonomy | Distinguished in light of CJEU Opinion 1/17 upholding CETA |
| CJEU Opinion 1/17 (2019) | CETA compatible with EU law if tribunals cannot rule on EU norms | Relied upon to reject Article 34 attack |
| Komstroy v. Moldova (CJEU 2021) | Broad reach of EU law over investment arbitration | Cited to show CJEU vigilance protecting legal autonomy |
| Van Gend en Loos (1963) | Autonomy of EU legal order | Part of analysis on interaction between CETA and EU law |
| Internationale Handelsgesellschaft (“Solange I”) | “So long as” doctrine on constitutional identity | Analogy used to frame conditional compatibility approach |
| Reid v. Covert (US 1957) | Treaties cannot override constitutional safeguards | Quoted to emphasise supremacy of Constitution over treaties |
Court's Reasoning and Analysis
The Court began by emphasising that constitutional review requires concrete probability, not abstract possibility. It found the Appellant’s claims of “legislative chill” entirely speculative: no evidence showed that parliamentarians would in fact refrain from legislating, and any such political apprehension was deemed a matter “for Kildare Street, not Inns Quay.”
Regarding Article 34, the Court accepted that CETA tribunals share some characteristics of an “administration of justice,” but held that they operate solely in the realm of international law. They cannot annul Irish statutes, cannot compel Irish courts to alter their judgments, and their awards would be subject to domestic public-policy controls and EU law supremacy (including the possibility of a reference under Article 267 TFEU). Consequently, no unconstitutional subtraction of jurisdiction occurs.
The judgment repeatedly highlighted the treaty’s evolving nature. Recent draft interpretative statements by the CETA Joint Committee, especially on climate policy and legitimate public objectives, further reduced any risk of constitutional conflict. While acknowledging a theoretical “malign scenario” in which an award might clash with a final Irish judgment, the Court ruled that such an outcome is too remote to invalidate ratification.
Finally, the Court noted that any domestic implementation of CETA awards will require amendments to the Arbitration Act 2010. Enacting such legislation would, in the Court’s view, provide an adequate constitutional “floor” safeguarding Article 34 values without necessitating a referendum.
Holding and Implications
The appeal was DISMISSED and the High Court order affirmed.
Immediate effect: the State may proceed to ratify CETA without holding a constitutional referendum, subject to the Oireachtas enacting appropriate implementing legislation (particularly amendments to the Arbitration Act 2010). Broader implications: the decision clarifies that speculative or contingent harms will not suffice to defeat treaty ratification and that international arbitration mechanisms do not automatically offend Article 34 when confined to public-international-law disputes. No new constitutional doctrine was created, but the judgment reinforces a high evidential threshold for challenges predicated on hypothetical future events.
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