A new front has opened up in the NSW police bugging scandal after the former Crime Commission chief, Phillip Bradley, accused police commissioner Andrew Scipione of giving "demonstrably wrong" evidence to a parliamentary inquiry.

In an explosive submission Mr Bradley says the suggestion by Mr Scipione and his predecessor Ken Moroney that the Crime Commission "obstructed" an internal investigation into the scandal is "demonstrably wrong and must be rejected".

But Mr Scipione has rejected Mr Bradley's claim.

In his response he quotes from an annexure to a report by the Inspector of the Police Integrity Commission David Levine that says the Crime Commission "refused to supply" key documents to the internal investigation.

"I therefore do not accept the statement ... that the evidence provided by myself and Mr Moroney was 'demonstrably wrong and must be rejected'," Mr Scipione says.

The scandal emerged from Operation Mascot, which used a corrupt former policeman, code named M5, to target allegedly corrupt police with a listening device between 1999-2001.

It emerged there was insufficient or no evidence of wrongdoing by many of the more than 100 police and civilians whose names appeared on warrants issued by the Supreme Court.

It has rocked the highest offices in the NSW Police as Deputy Commissioner Catherine Burn was team leader of Mascot, which bugged her fellow deputy commissioner Nick Kaldas more than a decade ago.

Complaints about Mascot were initially investigated by an internal police inquiry, Strike Force Emblems.

But in their evidence to the inquiry Mr Scipione and Mr Moroney said Emblems had been impeded by the Crime Commission's refusal to hand over key documents, citing secrecy provisions.

However, in his submission written by barrister Arthur Moses, SC, Mr Bradley takes issue with this version of events, citing a document tabled at a July 2004 meeting of the Crime Commission Management Committee outlining the efforts made to cooperate.

In the 2004 document Mr Bradley outlines the Crime Commission's willingness to consider requests for information by Strike Force Emblems subject to legal and other considerations.

But he also says he has "concerns" about Strike Force Emblems – which he says were shared by then commissioner Ken Moroney – because confidential details about its work were being leaked to the media.

"Because of those concerns, I cannot provide highly confidential information to that Task Force," he wrote.

Mr Scipione has responded to Mr Bradley's claim saying his evidence was based on findings of the Strike Force Emblems report which stated that "investigations could not be progressed as limited material was supplied by the NSW CC" and that the commission had not allowed officers to be interviewed.

Mr Scipione says this and the annexure to Mr Levine's report led him to believe it was "more than open to conclude" that the Crime Commission had refused access to material sought by Emblems investigators.