Police Commissioner Andrew Coster says his frontline staff will use commonsense and discretion when using "remarkable" powers granted to police.

Police's 105 non-emergency line received nearly 600,000 calls in its first year of operation.

An audit of the gun buyback scheme found police managed it effectively and compensation was appropriate, but compliance was difficult to measure.

The number of adults on the police's National Gang List has risen by a third since the last election but gang crime has fallen over the same period.

During the pursuit, the fleeing vehicle reversed into the police vehicle.

Tasman Police say one of the side effects of the coronavirus lockdown has been the increased visibility of criminal activity in the community.