A Gold Coast police officer denied using an email address linked to the release of CCTV footage of police bashing a handcuffed man when questioned by investigators.
Rick Flori, 47, is on trial at the Southport District Court on two counts of misconduct in a public office.
The former sergeant allegedly leaked footage to the media of officers kneeing and punching Noa Begic in the basement car park of the Surfers Paradise police station in January 2012.
Flori has pleaded not guilty to both charges.
On Friday, the court was played audio recorded during a search of Flori's house by officers investigating the leaked footage.
In the audio, Flori says he has no knowledge of an email address allegedly used to arrange the release of the footage to a journalist at The Courier-Mail newspaper.
Flori had earlier led investigators to a USB stick containing the footage which he said he'd copied for "training purposes".
Defence barrister Saul Holt QC conceded on the opening day of the trial his client was the one who had released the footage, in a bid to expose a culture of brutality at the station.
Prosecutors argue Flori released the footage due the involvement of Senior Sergeant David Joachim, an officer who had received a promotion that Flori had been overlooked for.
Earlier, the court heard Mr Begic had dropped his complaint against the officers shortly after receiving a financial settlement.
Inspector Glenn Morris, who led the internal investigation into the incident, confirmed Mr Begic's complaint was withdrawn after the settlement concluded.
Insp Morris said he was unclear if the complaint withdrawal was linked to the settlement.
However, once the complaint was withdrawn, police ethical standards command could no longer bring criminal charges against the officers involved, he said.
"The course of action available was disciplinary action because of the withdrawal of the complaint," Insp Morris said.
The trial continues.
Australian Associated Press