Western Australia's police commissioner is backing more consistency with rewards to help solve cold-case murders after some grieving families asked why their cases had missed out while others received jumps in cash offers.
The Labor state government recently boosted the rewards posted for three cold-case homicides to $250,000 and Police Minister Michelle Roberts last week said a review of the reward system was under way.
But the recent announcements has prompted frustrated families of other victims to push for increased rewards for all unsolved cases.
Police Commissioner Chris Dawson said it was not a police decision, but the force provided advice to a committee.
"Ultimately, it's a policy decision and as to what the amount is, that is under review and certainly that committee can give advice to government about that," he told ABC radio on Monday.
"Certainly, if there's inconsistencies or there's some sort of way in which we can harmonise that, that would be a good thing."
The reward increase began with the re-launched investigation into the murder of 21-year-old Joshua Warneke, found dead on the side of a Broome road in February 2010.
Then came the murder of 47-year-old prospector Raymond Kehlet and the disappearance of his 49-year-old wife, Jennie, in the outback area of Sandstone in March 2015.
Last week, the reward was boosted to help solve the disappearance and suspected murder of 28-year-old Lisa Govan, last seen in October 1999 near Kalgoorlie's Foundry Hotel, which at the time was next to the Club Deroes bikie gang clubhouse.
Regarding the Kehlet couple and Ms Govan's cases, Mr Dawson said police had received some information since the rewards were lifted, but it was not advanced to the stage where he could publicly provide details.
"We're still seeking further information on these cases, or any case. We don't actually stop any of them," he said.
"Irrespective of the reward scenario, we will always be ready and open to receive any information."
Mr Dawson said WA had a dedicated cold-case homicide team, which other states were looking at adopting too.
SOME OTHER UNSOLVED HOMICIDES:
* Sarah Anne McMahon, 20, vanished in November 2000 after leaving work in Claremont to meet someone in the Bassendean area. A suspect was questioned during a coronial inquest in 2012 but he denied killing her. No reward has been offered
* Child care worker Kerry Turner, 18, was found dead at Canning Dam in July 1991. It is believed she had been hitchhiking home after a night out. There is a $50,000 reward on offer.
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