Victoria Police officers fake breath tests

Victoria Police officers faked more than 258,000 roadside breath tests, an audit of five years' worth of data has uncovered.

Claims officers were duping the tests, by placing a finger over the straw entry hole or blowing into the straw themselves, were first reported late last year, Victoria Police said in a statement on Thursday.

"The investigation, which analysed over five years of data, 1500 preliminary breath test devices and more than 17.7 million tests, disappointingly found 258,463 PBTs or 1.5 per cent of all tests had been falsified," Professional Standards Command Assistant Commissioner Russell Barrett said.