A New Plymouth defence lawyer says he will be watching closely to make sure police officers do not have free access to remand prisoners in the city's new police station.
Paul Keegan says he is concerned about the autonomy of the remand centre, which is the first shared facility in the country.
The station, which opens on Monday, contains 24 remand cells that will be managed by corrections officers.
Mr Keegan says police officers should not be able to question prisoners on remand whenever they want.
He says he will be careful to ask his clients in custody if they are being visited by officers from the police station.
Police say the shared building is a chance to save on infrastructure costs and to work more closely with Corrections.