Nauru spy allegations consistent: doctor

It's completely plausible a Greens senator was spied on while she visited Nauru's detention centre, the psychiatrist who oversaw the mental health of asylum seekers on the island believes.

Dr Peter Young told a parliamentary inquiry on Tuesday allegations that Sarah Hanson-Young was watched during her visit to Nauru in 2013 were "very consistent" with what occurred when outsiders came to the island.

"There were communications from the (immigration) department that staff needed to be warned not to speak out of turn ... That was generally what occurred when there were external visitors," he said.