John Holland Pty Ltd v Inspector Nathan Hamilton

The High Court of Australia considered a dispute between John Holland Pty Ltd and Inspector Nathan Hamilton concerning charges laid under the *Occupational Health and Safety Act 2000* (NSW). John Holland Pty Ltd sought declarations that the charges were invalid due to inconsistency with Commonwealth legislation, specifically the *Occupational Health and Safety Act 1991* (Cth). The core of the dispute revolved around whether John Holland Pty Ltd, having become a "non-Commonwealth licensee" under the federal Act after the alleged offences were committed but before the charges were laid, could still be prosecuted under the NSW Act for those prior offences.

The legal issues before the High Court were whether the provisions of the NSW Act authorising the prosecution of offences committed before John Holland Pty Ltd became a non-Commonwealth licensee were inconsistent with the federal OHS Act. This inconsistency, if found, would render the NSW provisions invalid by operation of section 109 of the Constitution. The Court was required to determine the scope and effect of the federal OHS Act, particularly its application to entities that transition into or out of the definition of a "non-Commonwealth licensee" during the period relevant to alleged offences and subsequent prosecution.

The High Court reasoned that section 109 of the Constitution operates to invalidate state laws where there is a relevant inconsistency with a valid Commonwealth law. However, the Court found that the federal OHS Act did not preclude the prosecution of John Holland Pty Ltd under the NSW Act for offences committed prior to it becoming a non-Commonwealth licensee. The Court determined that the federal Act's provisions did not create an inconsistency that would invalidate the NSW prosecution. The Court applied the principle that a change in status under Commonwealth legislation does not necessarily extinguish liability for past conduct under state law, unless the Commonwealth law expressly or implicitly provides for such an effect.

The High Court made declarations that the charges laid against John Holland Pty Ltd were not rendered invalid, null, or void by the *Occupational Health and Safety Act 1991* (Cth) and section 109 of the Constitution. Consequently, the Industrial Court of New South Wales retained jurisdiction to hear and determine the proceedings upon those charges. John Holland Pty Ltd was ordered to pay the costs of the removal application.