Three new cases of coronavirus were announced in the state on Friday, with all three in quarantine.
"Their story didn't add up". "It's a real worry, especially because people who become infected are not showing the typical symptoms that we are used to", Marshall said.
"The selfish actions of this individual have put our whole state in a very hard situation".
"His actions have affected businesses, individuals, family groups and it is completely and utterly unacceptable".
Not even dog walks allowed: This country has imposed world`s toughest lockdown
On Friday, it emerged that a COVID-19 positive person had lied to contract tracers, telling them he'd merely picked up a pizza at Adelaide's Woodville Pizza Bar rather than being honest about working several shifts behind the counter.
"The Emergency Management Act requires people to provide information on request", he said.
From midnight Saturday, the stay at home orders will be repealed.More news: Agency Advises Against Holiday Travel Amid COVID Surge — CDC Cancels Thanksgiving
Nevertheless, the premier said the move to lift the lockdown early would proceed with SA largely moving to a one person to every four square metres density requirement.
Groups of 50 will be allowed in public.
Religious ceremonies will be restricted to 100 people and 10 people can come together for private gatherings.
Personal care providers, such as hair dressers and beauty therapists, will be required to wear masks while patrons are strongly encouraged to wear masks too.More news: Rapper fired a flamethrower on the bus then surrendered
A similar system is already in place in the Northern Territory, where health officials repurposed defence base Howard Springs as a quarantine facility.
A government spokeswoman on Friday confirmed the state will begin receiving worldwide arrivals from 7 December, with an initial cap of 160 travellers per day.
Thus, South Australia's COVID-19 outbreak draws parallels with Victoria's second wave disaster, which was also seeded by hotel quarantine breaches via untrained private security.
The hotel quarantine inquiry has made 69 interim recommendations to improve the program, including allowing some returned travellers to quarantine at home.More news: England to play two T20Is in historic Pakistan tour in 2021
No further details have been released about the man, and Police Commissioner Grant Stevens said current laws do not allow him to be arrested or charged.