Former Perth barrister Lloyd Rayney, who was acquitted of murdering his wife, has been cleared of arranging to have his home phone tapped to record his wife's conversations in the weeks before her death.

Mr Rayney had been on trial for the past week on two charges of arranging the unlawful intercepting of the landline at his family's Como home before the death of his wife Corryn in August 2007.

The Rayney marriage was breaking down, acrimoniously, in 2007, and it was alleged he wanted to record her conversations to find out what she was saying about him.

However, after legal argument, in which it was claimed by his lawyers that the case against Mr Rayney was fatally flawed, District Court Judge Andrew Stavrianou ruled Mr Rayney should be acquitted of both charges.

The jury was brought back into court this morning and told the judge's decision before it was discharged.

Judge Stavrianou acquitted Mr Rayney of one of the charges on Tuesday, after prosecutors conceded there was not enough evidence for the case to proceed. He delivered his ruling on the second charge this morning.

Outside court, Corryn and Lloyd Rayney's daughter Sarah Rayney said it was time for justice for her mother.

"My mum died in 2007 and that's more tragedy than any family should have to deal with," she said.

"But somehow since then our lives have gotten worse and worse, and that goes especially for my father more than anyone else.

"He's dealt with such accusations that nobody should ever have to deal with and it's time for that to end.

"It's time for that to stop and it's time for justice to be served for my mother."

Mr Rayney again called for an independent inquiry into the case.

"It's been decided time and time again that I'm innocent, that I'm not guilty of any crime," he said.

"All I want is for there to be a truly independent inquiry into everything surrounding Corryn's death so the killer or killers can be caught."

Mr Rayney's lawyer David Edwardson QC said Mr Rayney was an innocent man who had been victimised by police.

"Extensive submissions were put [forward] before these cases started as to why it shouldn't proceed but that was rejected and it hasn't even gone to a jury because there's no case to answer," he said.

"Button, Beamish, Mallard, Rayney. Really it's about time they did have an independent inquiry into this and it must be independent.

"No longer can they simply ignore what's been said so many times before today."

Evidence fails to prove allegations

The case collapsed because the evidence of one of the main prosecution witnesses failed to prove the allegations against Mr Rayney.

Timothy Pearson admitted installing phone tapping equipment in the roof space of the Rayney home, but his evidence at the trial did not substantiate the allegations prosecutors had made against Mr Rayney.

Mr Edwardson said Mr Pearson's evidence before the jury meant none of Mrs Rayney's calls from her home could have been intercepted by her husband.

That was because she was in Melbourne with the couple's two daughters in the time period that covered the first charge against her husband, and at the time of the second charge, Mr Pearson testified he had already removed recording equipment from the Rayney home.

In his decision today Judge Stavrianou said the evidence that had been presented against Mr Rayney was "incapable of sustaining verdicts of guilty".

He said Mr Pearson was the "key" to establishing the offences and he did not give the evidence that had been outlined by the prosecutor in her opening to the jury.

Judge Stavrianou also said at the time a recording device was in the roof space of the Rayney home, Mrs Rayney was away, and "it could not be excluded Mr Rayney was a party" to any calls that were made.

Mrs Rayney's family father and sister were in court for today's decision but made no comment as they left.

Defamation case brought by Rayney continues

The not guilty verdicts have come two-and-a-half years after Mr Rayney was acquitted of murdering his wife.

At the murder trial and at this latest trial, his lawyers argued the charges against him were the result of a flawed police investigation, in which officers had "tunnel vision".

The verdicts also bring an end to criminal proceedings against Mr Rayney.

The focus will now be on the multi-million-dollar legal action he started against the state of WA after police named him, in 2007, as the "prime suspect" in his wife's murder.

At the time, Mr Rayney was a high profile criminal barrister after spending years as a senior prosecutor with the Office of the Director of Public Prosecutions.

He has always denied having anything to do with his wife's death and after his acquittal has repeatedly called for a cold case review of the police investigation.