Labor MLC Lynda Voltz has criticised an investigation by NSW parliament into sexual harassment claims against former NSW ALP boss Jamie Clements that found there was "insufficient evidence" to substantiate the allegations.
Ms Voltz is a former military policewoman who investigated sexual harassment and assault allegations in the Australian Defence Force during the 1980s and '90s.
She questioned why the investigation finding was based on "the balance of probabilities" as outlined in a letter to Mr Clements last October.
Fairfax Media revealed the confidential findings after Mr Clements resigned as general secretary following allegations he tried to kiss a staff member, Stefanie Jones, in a parliament house office last year.
Mr Clements was never charged and denies the claims, which were the subject of an apprehended violence order application brought by police last year.
Police withdrew the application and Mr Clements, without admissions, agreed to stay away from Ms Jones for 12 months.
But Mr Clements quit after federal Opposition Leader Bill Shorten called for a report and opposition leader Luke Foley urged him to resign.
The letter says parliament's investigator found "insufficient corroborating evidence, on the balance of probabilities, to substantiate the allegations".
It also found Ms Jones "exhibited a genuine level of anxiety regarding her interactions [with Mr Clements]."
But Ms Voltz said: "If this is the bar we are going to set for women wanting to make a complaint of sexual harassment there will be a lot of women discouraged from coming forward".
This was particularly the case "if they know the offender is going to receive a document that will end up in the media."
Ms Voltz has written to the Clerk of the Legislative Council, David Blunt, requesting an explanation.
"It's about how they reached their conclusion, why the letter was sent and how victims will feel in the future about coming forward to make a complaint," she said.