Professor Paddy Mallon:

Every time one tests, one improves. The testing is not predictive so what it does is remove positive cases from the pool. With every test carried out, one removes more positive cases. One could test every day for seven days and it would be better than testing on day one and day three. It is never going to be 100%. Along with any plan for testing, there will still be a requirement for the individual to behave responsibly and report symptoms. In my view, given the impact of the community transmission of this virus from a public health perspective, as has been demonstrated in Victoria, as well as its economic impact, it is difficult to see how something would improve quarantining for 14 days.