Eh, I am resigned to the fact that CT is likely to either be caused by an abscondee (less likely) or a false day 12 negative test (small chance but not impossible).
There are guards and moonlighting nurses and staff etc going into these hotels every day and then back out home into the community. I would be guessing that's going to be the most likely avenue?
I have hear the argument that they are all wearing PPE and taking precautions. But even doctors and nurses wearing PPE can get it.. There are other potential holes too, such as airline flight staff and diplomats who apparently don't need to go into isolation hotels. So the risk IMO is there for it to get into the community at some point. The issue is detecting it as soon as it occurs, which relies on testing in the community around potential risk areas. The last thing we need is a random case int eh community being detected that can't be linked to someone coming into NZ, which started to occur, prior to heading into level 3 then 4. Based on the failure of Australians tracing, I don't have much faith that our tracing ability will have improved substantially, and tracing is essentially the backstop. If that fails, then a lock-down is really the only option as per Melbourne, and IMO they have been too slow to implement it.