Overburdened police are struggling to deliver an effective child sex offender register.
A proactively released Cabinet paper said there was "still work to be done" to make sure the register was working as intended.
Between October 2019, when an evaluation of the first three years of the register was concluded, and June last year, there was a 16 per cent total increase of people on the register, from 2687 to 3114, the Cabinet paper said.
There was a 34 per cent rise in people on the register being monitored in the community, to 1846.
Of those, 67 per cent were monitored by police and the rest by the Department of Corrections.