Police could soon be able to charge schools for vetting criminal records but Bay principals say the service is necessary to protect students and the education sector should not have to pay.
Acting Police Minister Anne Tolley, who presented The Policing (Cost Recovery) Amendment Bill to Parliament, said police vetting was an "extra service" not core police business.
She said it was appropriate public agencies and public organisations such as education, community services, caregiving and other health services be charged a fee.
Ms Tolley said New Zealand was one of the few countries which did not already charge for the service.
Demand for police vetting checks had almost doubled in the past decade, with about 470,000 requests each year, she said.