The Australian Biosecurity Act (2015) was passed by parliament June 16, 2015, which superseded the Quarantine Act 1908. Built in to this act are human rights safeguards.
Fast forward: A Biosecurity Emergency was declared on March 19, 2020, but only 2 Australian borders directions were declared under the Act. All other “pandemic response” measures were passed off to each state and territory of Australia.
It is important to understand that only when a Federal law is in conflict with the State does the Federal law override it. Each Australia state and territory enacted their own emergency powers in March 2020, which were not in conflict with external border directions – as such, state powers have bypassed human rights and constitutional laws