The government has restored Immigration New Zealand's power to deport resident immigrants, but with new conditions.
Immigration Minister Michael Woodhouse stripped the agency of that authority in certain cases last month, saying his expectations were not being met.
The agency had allowed an Afghan immigrant to remain in New Zealand, despite being twice convicted of sex crimes.
Mr Woodhouse said he had met with immigration officials and believed they made good decisions in general. But he said they would have to notify his office if they intended to let someone stay in the country after being convicted of a serious or sexual assault.
Mr Woodhouse would also meet with officials every three months now to discuss their approach to such cases.