The Northern Territory and South Australia have reopened their borders to states which have been successful in fighting COVID-19 and imposed either closures or quarantine requirements to those travelling from Victoria or New South Wales.

Mr Thomson said replacing the hard border with a ban on travel from coronavirus hotspot areas created a risk due to the five to seven-day lag before an undetected outbreak was typically identified.

"If you reduce the risk of people with the virus coming in, that means you can relax the measures inside the border for the reason that the risk is nowhere near as great because of the efficacy of the border closure," he said.

Mr Palmer’s lawyer, Peter Dunning QC, said the state had, through current measures, shown it was willing to accept a very low level of risk of coronavirus re-emerging in the community.

He said evidence given from each of the five public health experts during the hearing, including WA’s Chief Health Officer Andrew Robertson, estimated the risk of the virus returning to WA from interstate was less than 1 per cent and would remain that way if the border was lifted to all but coronavirus hotspots.

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