Former champion jockey Kieren Fallon has attended a hearing in France following a failed drugs test.
The Irishman, 42, must wait to find out if he will be punished over a positive B sample following Myboycharlie's win at Deauville in August 2007.
His lawyers have indicated some aspects of the test result were "curious".
The news that Fallon had tested positive for a banned substance, believed to be cocaine, emerged the day after his race-fixing trial collapsed.
Fallon, six-times the champion jockey in the UK, was acquitted of conspiracy to defraud at the Old Bailey on 7 December.
He appeared before officials from the French racing authority France Galop on Wednesday.
"I have been to Paris for another hearing at France Galop," he said.
"I expect they will get in touch with me when they get in touch with me."
Fallon failed the test on 19 August in Deauville where he won the Group One Darley Prix Morny on Myboycharlie.
The jockey could face a lengthy ban, having already served a six-month suspension imposed by France Galop for testing positive for a metabolite of cocaine (produced by the body after it has processed a chemical) in June 2006.
That suspension effectively meant he could not ride on any racecourse in the world, as other governing bodies have a reciprocal suspension policy in such cases.
Fallon is 43 in February and his position as number one jockey to the powerful Coolmore operation, and trainer Aidan O'Brien, hangs in the balance.
The Irishman, 42, must wait to find out if he will be punished over a positive B sample following Myboycharlie's win at Deauville in August 2007.
His lawyers have indicated some aspects of the test result were "curious".
The news that Fallon had tested positive for a banned substance, believed to be cocaine, emerged the day after his race-fixing trial collapsed.
Fallon, six-times the champion jockey in the UK, was acquitted of conspiracy to defraud at the Old Bailey on 7 December.
He appeared before officials from the French racing authority France Galop on Wednesday.
"I have been to Paris for another hearing at France Galop," he said.
"I expect they will get in touch with me when they get in touch with me."
Fallon failed the test on 19 August in Deauville where he won the Group One Darley Prix Morny on Myboycharlie.
The jockey could face a lengthy ban, having already served a six-month suspension imposed by France Galop for testing positive for a metabolite of cocaine (produced by the body after it has processed a chemical) in June 2006.
That suspension effectively meant he could not ride on any racecourse in the world, as other governing bodies have a reciprocal suspension policy in such cases.
Fallon is 43 in February and his position as number one jockey to the powerful Coolmore operation, and trainer Aidan O'Brien, hangs in the balance.