The Judicial Control Authority has found top jockey Lisa Cropp guilty of taking illegal drugs.
The case relates to races at Te Rapa in 2005, where she was drug tested, with the sample coming up positive for methamphetamine and amphetamine.
Cropp was charged with breaching rules of racing, and the case has been through numerous court and racing authority challenges.
The authority issued the latest ruling on Thursday, stating the case against Cropp has been proven.
Issues of penalty and costs are yet to be determined, but the maximum penalty is 12 months disqualification and a $10,000 fine.