The Robert Heathcote stable received some positive news with the four horses scratched in Brisbane last week all returning swabs with no irregularities.
Startantes, Prince Of Boom, Crymenonears and Starvirgo were withdrawn by order of stewards on race morning last Saturday after the substance Hemoplex, which contains small amounts of the banned substance cobalt, was found during a routine stable inspection.
Hemoplex was placed on the banned list in May last year with Newscorp reporting Heathcote was unaware of the change.
The four horses are permitted to race again, with Startantes, a placegetter in Group 1 company in Sydney at her last start, cleared to run in the Group 2 Victory Stakes at Eagle Farm on Saturday.
A stewards' inquiry into the events that led to the four horses being withdrawn is yet to be held.