Thoroughbred racehorse trainer Doug O’Neill could face a suspension and fine stemming from a 2010 finding in California that a horse in his care had an elevated level of total carbon dioxide (TCO2) in his blood system.

O’Neill, the winning trainer in the May 5 Kentucky Derby Presented by Yum! Brands (gr. I) with I’ll Have Another, has had three prior TCO2 violations–two in California and one in Illinois. He served a 15-day suspension in connection with the Illinois case.

An administrative hearing into the most recent case, involving a horse named Argenta at Del Mar Thoroughbred Club, in Del Mar, Calif., in August 2010, has been completed, according to the California Horse Racing Board (CHRB). Officials refused to say, however, if the hearing officer in the case has issued a ruling.

If a decision has been rendered, commissioners from the CHRB would meet in executive session during its regularly scheduled meeting May 24 at Betfair Hollywood Park, in Arcadia, Calif., to review the findings