The thoroughbred racing industry is looking to introduce stronger penalties for drug use.
The Judicial Control Authority has found top jockey Lisa Cropp guilty, after she tested positive for methamphetamine and amphetamine at races in Waikato in May 2005.
Cropp was required to provide a urine sample, which tested positive for the drugs.
Her penalty has yet to be determined, but the maximum possible is a disqualification of 12 months and a fine of $10,000.
Cropp is estimated to have earned at least $500,000 while riding in the meantime.
Reed Sanders of Thoroughbred Racing says a rule change in 2007 now means riders are stood down as soon as a discrepancy is found in a sample, but that did not apply to Cropp.
He says the agency is now looking to increase both the disqualification period and the maximum fine. Any rule changes should be in place by August.