After clinching a win at Lingfield in February a test on the horse, trained at the time by Jeremy Noseda, showed traces of the Class A substance.
The Guardian approached Noseda for a comment but were refused.
News of the failed test emerged at the end of March but the British Horseracing Authority has also refused to comment.
It is not unusual for racing’s ruling body to delay for some months before issuing charges after a positive test.
It took almost all of last year for the BHA to close a case after a horse of his returned a positive test for a steroid in January.
Noseda is expected to face charges because of the BHA’s strict stance that a trainer is responsible for their horses.
The 54-year-old would avoid charges only if the BHA were satisfied with an explanation that cleared him.
Noseda is no stranger to the process, in 2016 he was fined £2,000 for two separate positive tests returned the previous year by his horse Librisa Breeze.
One of those occasions related to a finding of temazepam in the grey’s system after he ran at Windsor in June 2015 and that sample was also found to contain a metabolite of cocaine after further examination.
Walk In The Sun has since joined the Wiltshire-based trainer Martyn Meade and is expected to run at Royal Ascot.
A BHA spokesperson said: “It is BHA policy not to comment on investigations or speculation surrounding potential investigations.”
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