Palmer v Western Australia

Western Australia's COVID-19 border-closure regime (the Quarantine (Closing the Border) Directions under the Emergency Management Act 2005 (WA)) did not contravene s 92 of the Constitution, because the burden it imposed on the freedom of interstate intercourse and on interstate trade and commerce was, on the agreed and found facts, reasonably necessary and proportionate to the legitimate end of protecting public health from a contagious disease.