Victoria's chief steward has denied high-profile trainer Peter Moody is being targeted by the state's integrity unit.

On Wednesday, a Moody-trained horse was scratched from a race at Pakenham for a race day treatment, prompting an emotional outburst from the trainer who said he was ready to walk away from the sport.

Moody admitted responsibility for the treatment before expressing his frustration at elements of the ongoing cobalt case against him.

He also said he had been told by former jockey and RV employee Michael Healy he had a meeting with chief steward Terry Bailey and integrity officers 18 months ago about the possibility of Healy entering the stable to become an informant.

Bailey admitted the meeting took place but said the concept, later dismissed, was directed at all trainers.

"At the end of the day we have one rule book whether it's a leading trainer or a two-horse trainer in the country," Bailey told Melbourne radio RSN.

"We did discuss the concept and it wasn't particularly directed at Mr Moody's stable. It was targeted at all trainers.

"In the end we didn't do it. We did a risk assessment into it and decided not to go ahead with it."

Bailey said they discussed the possibility of covert operations with Racing Integrity Commissioner Sal Perna.

"Mr Perna came back to me with positives and negatives and after we weighed that up we decided it wasn't worth it," he said.

Bailey emphasised integrity was paramount and his department would continue to apply the rules with no exceptions.