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				Originally Posted by 
Arapiles
				 
			That article would barely pass at Law School.   The fact that this wasn't imprisonment is shown by the fact that people were in fact able to leave their houses and therefore be fined, noting that you can't freely leave a prison but instead have to break out.  And, generally speaking, prisoners don't get to go out for jogs or ride their bikes so long as they stay within X kilometres of their prison.  
Relevantly, from the time of the Magna Carta onwards, quarantine powers existed in England and that included locking down and isolating whole villages.  The "arbitrary" issue is dealt with by the fact that directives were made under a specific law.
			
		
	 
 Just read the article again. They had to use the word ' detained ' , because imprisonment without a trial would be illegal. And the definition of arbitrarily explains it's use. So to my untrained eye, and even less trained mind, it would seem the good Professor knows his stuff. 
arbitrarly.
"without restraint in the use of authority; autocratically."
A more recent declaration of principle is found in 
section 22 of the New Zealand Bill of Rights Act 1990, which says, “Everyone has the right not to be arbitrarily arrested or detained.”