The state's anti-corruption watchdog has called on Victoria Police to release the full report into the widespread falsification of breath tests by officers.
The Independent Broad-based Commission Against Corruption has overseen Victoria Police's response to the issue, which came to light in May last year when Victoria Police revealed officers had faked more than 250,000 preliminary breath tests in five years, with some rural areas over-represented.
Victoria Police appointed former chief commissioner Neil Comrie to undertake an independent investigation, and in January released the executive summary of Mr Comrie's report.
Now, IBAC has requested Victoria Police publicly release the full report, as well as a report written by Centre for Ethical Leadership director Peter Collins.
"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.
In a statement, Victoria Police said it was working with IBAC, the government and road safety partners to address the report's recommendations.
"This includes reviewing current breath testing arrangements and strategies and working to ensure targets are evidence-led and achievable," the statement said.
During his investigation, Mr Comrie found Victoria Police sought to meet a road safety measure in which no more than 0.5 per cent of tested drivers would be found drink or drug-driving.
The budget allocated to Victoria Police was partly based on this target.
Mr Redlich said the falsification of tests meant police avoided catching drivers committing such offences.
"The aspirational road safety target that no more than half of one per cent of drivers being found over the limit was determined to be an unrealistic and unachievable safety standard," Mr Redlich said.
"Mr Comrie found it led to perverse and illegitimate methods being employed to convey a false impression the measure was being met."
IBAC has told Victoria Police and government departments that such measures of road safety should not be used by the police, nor should they influence the budget.
The agency says new metrics for breath tests need to be set quickly, and open to public scrutiny.
Mr Collins' report identified a "whacking" culture in which officers were reprimanded if they did not meet these targets.
Junior officers were also encouraged to target drivers unlikely to be drug or alcohol-affected, he reported, rather than those who were.
Victoria Police has told IBAC further investigations are ongoing.
The organisation accepted all 23 recommendations in Mr Comrie's report.
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