Summary of Judgment — High Court (Planning & Environment)
Factual and Procedural Background
The Plaintiffs are residents of The City who live with their teenage daughter. The First, Second and Third Defendants own separate lands adjacent to the Plaintiffs' property on three sides and across the main road in front of the Plaintiffs' property. The Plaintiffs brought proceedings asserting that the First, Second and Third Defendants' use of pesticides and, in the case of the Third Defendant, spreading of slurry, are causing personal injuries to members of the Plaintiffs' family, damage to property and other harms.
The Plaintiffs issued a Plenary Summons on 30 June 2025 and sought interlocutory injunctive relief by Notice of Motion issued 15 July 2025. The Notice of Motion sought, in form, a "prohibitive permanent injunction" but the court noted that permanent relief can only be granted at trial and that the current application was for interlocutory relief. The Fourth Defendant is an authorised officer within Company A and is sued in that capacity; the Fifth Defendant is the Minister (the Fifth Defendant). No interlocutory relief was sought against the Fourth or Fifth Defendants.
A document headed "Statement of Claim" was uploaded to a file-sharing system shortly before the hearing but was not served. The Third Defendant did not appear and there was no affidavit of service on him. The hearing proceeded before Judge Farrell with affidavit evidence from the Plaintiffs and replying affidavits from the First and Second Defendants.
Legal Issues Presented
- Whether the Plaintiffs have demonstrated a fair question to be tried sufficient to warrant the grant of interlocutory injunctive relief restraining the First, Second and Third Defendants (in particular a request for a 100-metre buffer zone prohibiting pesticide use and, in respect of the Third Defendant, spreading of slurry) pending trial.
- Whether the Plaintiffs have adduced sufficient admissible evidence, including medical or scientific evidence, to establish a causal link between the Defendants' alleged pesticide/slurry use and the Plaintiffs' asserted medical conditions and harms.
- Whether aspects of the relief sought (including requests to restrain alleged abusive conduct or harassment and other non-pesticide-related conduct) present a fair issue to be tried.
- Questions of service and participation: whether the Third Defendant had been served and whether interlocutory relief could properly be sought in respect of defendants who had not been served.
Arguments of the Parties
Plaintiffs' Arguments
- The First, Second and Third Defendants are administering pesticides and other agricultural toxins in a manner that is causing the Plaintiffs personal injury, property damage and unemployment, and endangering the lives of the family.
- The Plaintiffs sought a prohibitive injunction preventing use of pesticides within 100 metres of their property and prohibiting the Third Defendant from spreading slurry adjacent to the Plaintiffs' land. They characterised the conduct as life-endangering and urgent.
- The Plaintiffs relied on their affidavits describing medical symptoms and events (including the death of pets and damage to trees) and exhibited correspondence with laboratories and certain documents (including an email from Company A and a veterinary report) and external judgments uploaded to the file-sharing system.
- The Plaintiffs contended that they had been unable to obtain certain tests domestically and referred to attempts to obtain testing abroad; they also asserted constitutional rights and criminal offences in the plenary material (though the court noted limits on such claims in this forum).
First and Second Defendants' Arguments
- Both the First and Second Defendants admitted using pesticides but denied any inappropriate, abusive or harmful use; they asserted that their pesticide use was lawful, controlled and limited.
- The Defendants relied on regulatory authorisation frameworks (as described in correspondence from Company A) and on inspections and certifications (including by Company B) to show compliance. The First Defendant exhibited evidence of regulatory inspections and certifications and disputed the Plaintiffs' allegations of malicious conduct.
- The Second Defendant offered an undertaking (which the Plaintiffs declined). The Defendants submitted that the Plaintiffs' case was based on belief and suspicion and that the evidential threshold for a fair question to be tried had not been met.
Third Defendant
- The Third Defendant did not appear and there was no evidence before the Court that he had been served. Allegations regarding slurry were directed to the Third Defendant but, given lack of service and non-appearance, the Court treated that portion accordingly.
Table of Precedents Cited
| Precedent |
Rule or Principle Cited For |
Application by the Court |
| Merck Sharpe & Dohme Corporation v. Clonmel Healthcare Limited [2020] 1 I.R. 1; [2019] IESC 65 |
Describes the interlocutory application logic: establish a "fair issue to be tried" rather than prove the case at interlocutory stage; adopt flexible approach derived from American Cyanamid. |
The Court applied this principle to require that the Plaintiffs show a fair question to be tried before considering balance of convenience; the Court assessed whether the Plaintiffs' case was frivolous or vexatious and whether a fair issue had been raised. |
| Campus Oil v. Minister for Industry and Energy [1983] I.R. 82; [1983] IESC 2 (American Cyanamid principle) |
Reasserts the flexibility of interlocutory injunctions and that they serve to provide a just solution pending trial; introduces the "fair issue" and balance of convenience approach. |
The Court relied on the underlying theme of this line of authority to frame the test to be applied to the Plaintiffs' interlocutory application. |
| Fennell v. Slevin [2023] IECA 177 |
Sets out requirements for admitting hearsay in interlocutory applications: identity of the person who made the statement must be identified and the party must state belief in its truth. |
The Court applied this authority to assess the Plaintiffs' hearsay material and to conclude that many averments lacked the required identification or foundation and so could not be relied on. |
| Malone & Ors v. Laois County Council & Ors [2025] IEHC 345 |
Emphasises that lay litigants are subject to the same rules as represented litigants; fairness to both sides is paramount. |
The Court cited this authority to reiterate the procedural expectations on lay litigants and to explain the Court's role in adjudicating the matter impartially without descending into advocacy for either side. |
| Nihill v Everyday Finance DAC [2022] IEHC 484 |
Principle that the court should not speculate on central parts of a plaintiff's case where evidence is lacking. |
The Court relied on this authority to support the conclusion that it could not speculate about causation between pesticide use and the Plaintiffs' alleged medical conditions in the absence of evidential foundation. |
| Rogers and Another v Allied Irish Banks Plc and Others [2024] IEHC 50 |
Similarly affirms the court's inability to engage in speculation in the absence of evidence. |
The Court referenced this authority in concluding that speculative assertions in the Plaintiffs' affidavits could not satisfy the fair-question threshold. |
| John Donnelly & Sons Ltd v. Hoey & Anor [2024] IEHC 52 |
Example of a case where damages were awarded for crop damage caused by spray drift. |
The Court noted the decision but explained it was not directly helpful to the present interlocutory application and could not fill evidential gaps in the Plaintiffs' case. |
Court's Reasoning and Analysis
Judge Farrell (the Court) proceeded through the established interlocutory injunction framework: (1) determine whether there was a fair question to be tried, and if so (2) assess the balance of convenience and adequacy of damages. The Court began by accepting, for the purposes of the interlocutory application only, that the Plaintiffs suffer from the medical conditions described in their affidavits because the First and Second Defendants did not dispute the existence of the medical conditions. However, the Court made clear that acceptance of the existence of symptoms did not equate to acceptance of causation.
The Court scrutinised the evidential foundation. It found a complete absence of medical or expert scientific evidence linking the Defendants' lawful pesticide use (or, in the Third Defendant's case, alleged slurry spreading) to the Plaintiffs' medical conditions. Apart from a veterinary report relating to a cat (which did not specify a cause) and a hospital appointment notification for the Plaintiffs' daughter, there were no medical reports, expert opinions or diagnostic test results before the Court. The Plaintiffs' exhibits included photographs and various documents, but these did not establish causation.
The Court applied hearsay principles (citing Fennell v. Slevin) and the general rule that opinion evidence requires appropriately qualified experts; many of the Plaintiffs' averments were therefore inadmissible or of no evidential weight. The Court also struck out speculative and unsupported averments regarding third parties' health and causes of death, which were founded on online death notices and hearsay.
The Court noted regulatory context: the substances used by the Defendants are authorised and their lawful availability and authorised uses were not challenged; the relevant statutory instrument (S.I. 155 of 2012) had not been impugned. The Court accepted Company A's explanation (as exhibited) that active substances are authorised only after central and national evaluation of safety and use.
Taking account of the totality of evidence and authorities on interlocutory relief (including the Merck/American Cyanamid line), the Court concluded that the Plaintiffs had not discharged the burden of showing a fair question to be tried as to the central claim that the Defendants' actions placed the Plaintiffs' health and lives at risk. Because a fair issue was not established, it was unnecessary to proceed to balance-of-convenience considerations. The Court also addressed ancillary claims (such as requests to restrain alleged abusive speech) and found those too unsupported to make out a fair issue.
The Court further observed procedural deficiencies: the purported Statement of Claim had not been delivered or served in accordance with the Rules, and the Third Defendant had not been shown to have been served. Those procedural matters informed the Court's assessment.
Holding and Implications
HOLDING: The Court DISMISSED the application for interlocutory injunctive relief.
Implications and direct consequences:
- The Plaintiffs' request for an interlocutory injunction (including a 100-metre buffer zone prohibiting pesticide use and injunctions regarding slurry-spreading and alleged abusive conduct) was refused on the basis that the Plaintiffs had not demonstrated a fair question to be tried.
- The Court ordered costs in favour of the First Defendant against the Plaintiffs (to be adjudicated in default of agreement) and awarded the Second Defendant the legitimated expenses and outlay incurred in respect of the motion (also to be adjudicated in default of agreement). The Court placed a stay on adjudication and execution of those costs orders pending determination of the proceedings, but refused to stay the proceedings generally.
- No interlocutory relief was ordered against the Fourth or Fifth Defendants (and none had been sought against them). The Third Defendant's non-appearance and absence of service were noted.
- The decision was based on the evidential record in this interlocutory application; the Court did not preclude the Plaintiffs from pursuing their claims at trial but emphasised that the present evidence did not meet the threshold required to obtain interim injunctive relief. The judgment did not purport to lay down new law beyond applying settled interlocutory principles to the facts before the Court.