Operation Turon was an investigation by the Independent Broad-based Anti-corruption Commission (IBAC) into the alleged police misconduct of then Victoria Police Assistant Commissioner, Brett Guerin.

In May 2017, Victoria Police notified IBAC of a complaint made against Assistant Commissioner, Professional Standards Command (PSC), Brett Guerin. The complaint alleged he had used an online pseudonym, 'Vernon Demerest', to post comments to Facebook regarding matters involving Victoria Police. Based on the limited information available to IBAC at the time to support the allegations, IBAC determined to return the matter to Victoria Police for action.

Seven months later, in December 2017, Victoria Police received further allegations that Assistant Commissioner Guerin had posted inappropriate material on various sites using the same pseudonym. In February 2018, Victoria Police notified IBAC of these allegations and IBAC commenced an investigation under section 64(1)(b) of the Independent Broad-based Anti-corruption Commission Act 2011 (Vic) (IBAC Act).

Assistant Commissioner Guerin resigned from Victoria Police while under investigation in February 2018.

IBAC found Assistant Commissioner Guerin engaged in police misconduct through his online trolling, both on and off duty, including in relation to matters relevant to Victoria Police and with information he obtained in the course of his duties.

IBAC did not find any evidence that his decision-making as Assistant Commissioner PSC was compromised by any underlying beliefs or views. However, IBAC found he used racist, homophobic and other offensive language to elicit a reaction to the comments he made while using online pseudonyms.

No criminal charges were laid against Assistant Commissioner Guerin. While his conduct was offensive and inappropriate, it did not meet the standard required to file charges under the Criminal Code Act 1995 (Cth).