Junior police officers were pressured by superiors to breath-test drivers more likely to be sober, according to a secret report Victoria's corruption watchdog wants the state's police force to release.
The Independent and Broad-based Anti-corruption Commission (IBAC) on Wednesday issued a public plea to Victoria Police to fully release two reports which reveal the depth of the force's false breath test scandal.
In May 2018 police were found to have falsified preliminary breath tests to meet quotas, prompting the suspension of some funding and an independent investigation by former police chief commissioner Neil Comrie.
Only the executive summary of Mr Comrie's report was released in January, which found unrealistic targets led officers to alter figures for preliminary breath tests, in a move labelled an "ethical failure".
IBAC on Wednesday said there was a second report written by the director of the Centre for Ethical Leadership Peter Collins.
That report includes interviews with about 350 police officers, and identifies 10 integrity issues in the force.
Among them were junior officers allegedly discouraged from detecting drivers who were affected by drugs or alcohol and instead encouraged to target drivers more likely to be sober.
Juniors also reported being 'whacked' for breath tests, meaning they were admonished by superiors and warned about their future if they did not meet their preliminary breath test targets.
"IBAC believes that full disclosure of the breadth and depth of issues revealed by these reports, along with Victoria Police's actions to date and planned response, will work to help restore trust in the approach to current and future testing and the road safety strategy," IBAC Commissioner Robert Redlich said.
In a statement, Victoria Police said it had accepted all of the recommendations made by Mr Comrie.
"We are currently working with IBAC, government and our road safety partners to address the recommendations made in the report," it said.
"This includes reviewing current breath testing arrangements and strategies and working to ensure targets are evidence-led and achievable."