A federal integrity commission investigation has found a former Border Force boss acted corruptly.

The Australian Commission for Law Enforcement Integrity (ACLEI) has published summary findings of an investigation into former Australian Border Force commissioner Roman Quaedvlieg.

The report follows the commission’s Operation Valadon, which investigated eight allegations of corrupt conduct made against Mr Quaedvlieg.

Most of the claims related to his alleged misuse of his influence and position as Australian Border Force commissioner.

Three of the eight allegations were proved.

However, no charges or action will be taken due to insufficient burden of proof.

The 55-year-old Mr Quaedvlieg has been embroiled in controversy after he used his position as a senior public servant to support an application and appointment to Border Force for his 25-year-old girlfriend, Sarah Rogers.

A stoush between him and his former boss, Home Affairs Minister Peter Dutton, made headlines when he was accused in federal Parliament of “grooming a girl 30 years younger than himself”.

Ms Rogers gave false evidence to the investigation into Mr Quaedvlieg's conduct, and has since been sentenced to a seven-month intensive corrections order and 100 hours of community service.

Mr Quaedvlieg found himself square on the wrong side of Mr Dutton after testifying to a Senate hearing regarding an au pair visa controversy.

At the time, Mr Dutton was accused of using his ministerial powers to overrule his own department and grant visas to at least two au pairs.

Mr Quaedvlieg testified that he was asked to help a “mate” of the minister who had a visa problem.

Since being sacked from his position as Border Force commissioner, Mr Quaedvlieg has written a “tell-all” account called Tour De Force, which should be published next month.

For now, Mr Quaedvlieg - a highly experienced investigator, a former ACT chief police officer and an assistant commissioner with the Australian Federal Police – is assessing his legal options.

He has called the commission's investigation “deeply flawed”.