An independent analysis of police breath testing data found more than 42,000 "irregular" breath tests, 12,000 more than initially believed.
RNZ revealed last year that about 130 police officers were under investigation throughout the country after 30,000 alcohol breath tests were "falsely or erroneously recorded".
Following RNZ's reporting the New Zealand Transport Agency (NZTA) halted $12 million worth of funding until it was satisfied police had met their breath test targets.
NZTA commissioned an independent analysis of breath testing data to try and identify the full scale of falsely recorded tests.
That report, by WSP, was released by NZTA to RNZ on Friday.
