Walk In The Sun, a $1.4 million purchase who is unbeaten in two starts, has tested positive for cocaine following his second victory at Lingfield in February when trained by Jeremy Noseda.
Owned by Phoenix Thoroughbreds, the three-year-old is now with Martyn Meade, having moved Newmarket yards following the owners' decision to remove their horses from Noseda in March.
The failed test was common knowledge within racing, with Noseda saying: "We're waiting on news," when asked about the matter by the Racing Post in March.
The Racing Post understands that the positive test is for a metabolite of cocaine.
If Walk In The Sun is found to have failed the post-race test at Lingfield then disqualification would be inevitable, and Noseda is likely to face charges from the BHA.
When asked to comment on the matter on Tuesday following a report in The Guardian, Noseda declined.
BHA spokesman Robin Mounsey said regarding the case: "It is BHA policy not to comment on investigations or speculation surrounding potential investigations."