Trainer Peter Moody has been formally charged over a positive swab taken from one of his horses in May.
Racing Victoria issued the charge on Monday relating to the detection of the prohibited substance Oripavine in a urine sample taken from Lethal Arrow after he won at Pakenham on May 17.
Oripavine is an opioid narcotic analgesic substance which may act as a stimulant in a horse.
Moody has been charged with presenting Lethal Arrow to race with a prohibited substance in its system.
Stewards also took the unusual step to note it was the “only current investigation pertaining to Mr Moody and his stable” after persistent rumours of multiple positive swabs.
Fellow Victorian trainer Mark Riley was also issued with charges on Monday pertaining to an elevated carbon dioxide (TCO2) level returned by Diablo Rosso before the horse ran at Pakenham on August 4.
Dates for the hearings have not been set.