Police will patrol Sydney supermarkets to ensure laws on QR codes and face masks are being obeyed.
The "compliance crackdown" will also focus on large retail premises across the Greater Sydney area, NSW police said on Monday.
NSW Police Minister David Elliott said he's "had it out" with people over NSW Health's reluctance to enforce compliance due to the bottlenecks it's expected to cause.
"Some (supermarkets) haven't been doing it," he told Sydney radio station 2GB on Monday.
"We will be telling the supermarkets ... they must employ security guards."
The move comes as about a quarter of recent, publicised exposure sites are supermarkets.
But that proportion didn't surprise NSW Chief Health Officer Kerry Chant, given supermarkets were essential during the citywide lockdown.
"People have to eat," she said.
Public alerts about case exposure sites weren't signs of transmission, she said.
The small number of transmissions in supermarkets had generally been from staff members becoming infected elsewhere and then passing the virus to their colleagues, she said.
"There have been a couple of cases where patrons have come in and infected staff, but generally it's the other way," Dr Chant said, saying authorities were more focused on smaller supermarkets where a large group of people will congregate.
Small businesses should minimise the number of customers inside and ask people to wait outside, she said.
Premier Gladys Berejiklian said even having a concierge person at the front of a supermarket was a risk.
"My strongest message is to have as little human-to-human contact as possible," she said.
Australian Associated Press