LEADING jockey Noel Callow's comeback is in limbo after he returned an irregularity in Malaysia this month.
Callow, just two meetings and four winners from seven rides into his return, has been stood down pending the results of the "B" sample.
Malaysian stewards told Callow at Kuala Lumpur on Saturday that a urine sample taken the previous weekend contained traces of banned substances ephedrine and phentermine.
Callow is bewildered by the positive result given he has taken the same herbal supplement for five years.
He said he took two capsules daily without a hint of any problem.
"I was tested 10, 15 times minimum in Singapore. I've been tested in Australia," Callow said.
"It's never been an issue and now I'm scratching my head. I don't know if they've changed their levels.
"All I know is that I haven't done anything different."
Under Malaysian rules, Callow is unable to ride until the completion of the stewards' inquiry.
Clearly frustrated, he said he didn't know when the inquiry would resume or what his fate would be.
"I have a wife and two children," he said. "In the past six months, I've worked two days.
"I suppose I'm going to have to apply for a job at Bunnings."
After dominating Singapore racing - he was leading rider for two years - Callow returned home in the spring because of weight problems.