Three Queensland thoroughbred trainers and three harness racing trainers have been notified of cobalt irregularities in tests returned by horses in their care.
Wade Birch, Racing Queensland’s general manager of integrity, said nine tests had come back with high levels in the A samples.
Six of those were from three harness trainers and the other three from the thoroughbred trainers.
Birch said the names of the trainers would not be released and there was a presumption of innocence until the results of the confirmatory or B samples were known.
He also said there was no indication of widespread use in Queensland racing.
Prominent Melbourne trainers Peter Moody, Mark Kavanagh and Danny O’Brien are the subject of a stewards’ investigation into high cobalt levels in horses while NSW trainer Darren Smith has appeared before stewards over high levels.