The Qld Public Health Act 2005 covers quarantine, it was an update of the 1937 act, and updated , I think, because of the SARS virus's that appeared around about then. Those who come under that act during coronavirus have been informed of their responsibilities , and it appears that penalties from the Act have only been enforced if , after being informed of their responsibilities , people ignore them. That's a sensible way to go about it. The States are responsible for Health , in the Constitution [ unless I'm mistaken] which is why the Federal Government was forced to form the National Cabinet, with all State and Territory leaders on board. It seems to have worked very well. I'm not sure if the Health Acts for all States are consistent , or even similar. 
"There are additional compliance measures available to Queensland Health under the Public Health Act 2005, and any further failure to comply may be subject to enforced quarantine and receiving fines of up to $13,345 and other penalties."
				
			
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