Due to growing concern of covid-19 we need to take action to protect ourselves and each other.
I think there is currently a need to completely ban reusable bags, and there is a need to stop selling them in woolies and coles, they simply increase contamination at checkouts.
I think there been news in the past about sales staff refusing to bag dirty grocery bags, but now this is a pandemic situation and all reusable bags need to be rejected no matter how clean they look.
It's possible that virus from quarantined people to be carried directly into supermarkets via the bags by family members, infecting sales staff and checkout machines.
UPDATE:
If your bored here a research paper outlining just this scenario.
https://www.neha.org/node/60021
Agree