Victoria Police secretly gave underworld barrister Nicola Gobbo an interview transcript of one her criminal clients to encourage him to "roll" and confess to at least one gangland murder, a royal commission has heard.
That criminal told police he had a "gut feeling" that Ms Gobbo preferred to help investigators rather than him.
On Friday, counsel assisting the royal commission into the Lawyer X scandal, Chris Winneke QC, asked one of Ms Gobbo's former police handlers if he and others gave her key information about her incarcerated client during 2006.
The former handler, referred to by the pseudonym "Sandy White", suggested this was done so Ms Gobbo could convince her client - accused alongside Carl Williams of murdering crime figures Pasquale Barbaro and Jason Moran - to plead guilty and assist police.
Mr Winneke suggested doing so would have deprived the man of receiving legitimate legal advice on whether he should plead to murder - a "troubling situation" that amounted to the crime of perverting the course of justice.
"What's happening here is Ms Gobbo is being tasked as a human source with a view to convincing him to roll and assist police by giving evidence," Mr Winneke said.
"You gave (the transcript) to her as an agent of the state, as a secret transcript, and not to tell (her client) that she'd read it."
Mr White said he couldn't confirm if the transcript was given to Ms Gobbo legitimately as a barrister or in her role as a police informer.
"She's not on (her client's) side. She's not acting for him, she's acting for the police," Mr Winneke said.
In a recorded interview, the criminal told Purana taskforce detective Stuart Bateson: "I don't think she'd sell me out" before adding: "I've got a gut feeling she'd rather help you out".
Also that year, Ms Gobbo apparently told Detective Bateson: "I try to steer away but I get lured back", referring to her troubled role as a police informer behind her clients' backs.
She also described "the ethics of the whole thing as being f***ed", Mr Winneke added.
On Thursday, Mr White said the police had been considering "exit strategies" to remove Ms Gobbo from her informing role "for quite some time".