A senior staffer to WA Premier Colin Barnett and the former chief of staff to Troy Buswell have been found to be in contempt of Parliament over information they gave to the Legislative Council about the former Treasurer's infamous 2014 car crashes.

The powerful Procedures and Privileges Committee recommended Mr Barnett's deputy chief of staff Stephen Home and Mr Buswell's former chief of staff Rachael Turnseck be forced to apologise to the Legislative Council.

The finding relates to an answer provided to the Upper House in early 2014 which was found by both the privileges committee and the Corruption and Crime Commission (CCC) to have been "misleading and ultimately false".

Mr Buswell smashed his ministerial car into several parked cars in Subiaco on his way home from a wedding in 2014, and subsequently resigned from the ministry.

The committee report found the two staffers deliberately constructed an "incomplete and misleading" answer that was given in Parliament to a question asked by Labor about who Ms Turnseck had spoken with about the events.

"This conduct is a substantial interference with the Parliament's information gathering and accountability functions," the report stated.

"It is also clear that Ms Turnseck consciously and deliberately withheld from Mr Home relevant information."

Mr Barnett told Parliament he had not read the report but was unlikely to agree with it.

"I doubt that I would concur with that report. However, the Upper House can do what it wishes," the Premier said.

Staffers claim they did not deliberately mislead

The report, and an earlier one by the CCC, found Ms Turnseck failed to disclose conversations she had had with the former Treasurer's family and fellow political staffer Leo Gibbons about Mr Buswell's car crashes.

On Ms Turnseck's advice to Mr Home, a reference to discussions with Mr Buswell's family was deleted from the answer to the Legislative Council.

She was also found to have deliberately failed to tell Mr Home about her conversation with Mr Gibbons.

Mr Buswell resigned from Parliament in the wake of his car crashes. ( ABC News )

In a statement provided to the committee, Ms Turnseck said she accepted and regretted that the answer was misleading and "apologised unreservedly".

But she described suggestions she deliberately misled the house as "most unfair".

"I trust that the members of the committee will accept that at no time did I seek to mislead the Council," she wrote.

In his statement to the committee, Mr Home also insisted he had not deliberately misled Parliament and said he was acting out of concern for Mr Buswell and his family.

"The information that I agreed to exclude from the answer ... was highly personal, at a time where Mr Buswell's personal health was still tenuous," he wrote.

The Legislative Council is set to consider in the next fortnight whether it will accept the contempt findings and order both Mr Home and Ms Turnseck to apologise in writing to the house.

Problem rests with Premier: Labor

Labor's government accountability spokesman Ben Wyatt said he would have thought Mr Home's position in the Premier's office was untenable, but argued the biggest problem rested with Mr Barnett himself.

"He has created a culture where secrecy reigns supreme," Mr Wyatt said.

"The future of Mr Home is really up to him, but in light of previous performance I have no doubt that Mr Barnett will find his behaviour acceptable."