Beau Lamarre-Condon, 31, has pleaded not guilty to the February 2024 murders of ex-partner Jesse Baird and Mr Baird's new boyfriend, Luke Davies.
The men's bodies were found at a rural property inside surfboard bags.
A friend who looked up to the former senior constable before the alleged murders also wanted to join the force, a NSW Supreme Court jury heard Monday.
That friend - who cannot be legally named - admitted to jurors he had spoken to police about the 31-year-old to help become an officer himself.
He wore a covert listening device when visiting Lamarre-Condon in jail in December 2025 with the recorded conversation being played in court.
"I just want to be sure you're not wearing a wire," the ex-officer said after asking his friend to lift up his shirt.
"You're so paranoid, bro," the friend responded.
The day the then-28-year-old disguised himself as an Uber Eats driver and entered Mr Baird's Sydney terrace, he confessed to the murders, the friend previously testified.
A changing story across seven police statements led defence barrister John Stratton SC to accuse the man of giving false evidence.
"You don't want to damage your prospects about becoming a police officer, do you agree or disagree?" the barrister asked Monday.
'I disagree," the friend replied.
He met Lamarre-Condon at a sushi restaurant the day after the killings, where he suggested disposing of the bodies in a dam was not a good idea.
He also pointed out a skip bin where the then-officer could dispose of clothing and other items but denied knowing these belonged to Mr Baird and Mr Davies.
He will return to testify for a third day on Tuesday.
The Crown alleges Lamarre-Condon killed Mr Baird "execution-style" at close range through a plan borne of a jealous obsession, before shooting Mr Davies to eliminate a witness.
Lamarre-Condon claims he killed the men in self-defence after entering their terrace to retrieve his belongings, including a surfboard.
His offer to plead guilty to Mr Baird's manslaughter has been rejected by prosecutors.
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