Victoria's racing integrity commissioner Sal Perna acted without fear or favour in a serious investigation into a cobalt leak that was no "frolic", a court has been told.

Former Racing Victoria chairman David Moodie wants a judge to overturn Perna's "devastating" findings that he inappropriately disclosed information and misled the RV integrity council and board.

The Victorian Supreme Court has heard the commissioner went off on a "frolic" in his investigation, which Perna's barrister Melinda Richards SC on Tuesday described as a completely unwarranted characterisation of what took place.