State of New South Wales v Buckland; Katena Pty Ltd v Buckland

The New South Wales Court of Appeal considered appeals by the State of New South Wales and Katena Pty Ltd against a judgment in favour of the respondent, Mr Buckland, who alleged negligence leading to a Parthenium weed infestation on his farm. The dispute centred on the introduction and use of a harvester that had previously been used in an area where the weed was prevalent.

The Court was required to determine whether the weed infestation was caused by the use of the harvester, and if so, whether there was negligence in the approval of the harvester's entry into New South Wales or in its subsequent use on Mr Buckland's farm. Crucially, the Court had to assess whether any proven negligence was causally related to the infestation.

By majority, the Court found that while the weed infestation was caused by the use of the harvester, the negligence in approving its entry into New South Wales was not causally linked to the infestation. Furthermore, the majority held that the alleged negligence in the use of the harvester was conjectural and not sufficiently proven to establish a causal link to the infestation. The dissenting judgment, however, considered the distinction between conjecture and inference and whether the facts permitted an inference of causally related negligence.

The appeals were upheld, and judgment was entered for the appellants. The respondents were ordered to pay the appellants' costs of the hearing and the appeal, with a certificate under the Suitor's Fund Act available if otherwise entitled.