Victoria's Transport Accident Commission has suspended funding of about $4 million to the police force after officers were found to have faked more than a quarter of a million breath tests.
Former Victorian police chief commissioner Neil Comrie will lead an investigation into why officers simulated roadside alcohol breath tests by either placing a finger over the straw entry hole or blowing into the straw themselves to "hide or highlight productivity".
An audit of more than five years of tests by the force's Professional Standards Command found 258,463 out of 17.7 million, or 1.5 per cent, had been falsified.
"It's very disappointing that I have to stand before you today and announce some incredibly poor behaviour by members of Victoria police," Professional Standards Command Assistant Commissioner Russell Barrett told reporters on Thursday.
"As disappointing as this is, it should be noted that, at this stage in the investigation, there is no evidence to suggest fraud or any criminality has occurred. Similarly, there is nothing to suggest that any of this activity has impacted on any prosecutions," Mr Barrett said in a statement on Wednesday.
