Okla. Admin. Code § 325:20-1-12
The Stewards shall maintain a List of Horses that, in their opinion or pursuant to any rule, are ineligible to be entered in A Race. The basis for inclusion may be poor or inconsistent performance, bolting, erratic behavior, questions concerning ownership by a suspended or non-licensed person, suspended Trainer awaiting proper transfer of Horse, eligibility, ownership dispute, claim protest, identification of the Horse, or for any other reason that might affect the integrity or welfare of racing. A Horse included on the List shall be ineligible to enter or compete in a Race until it has fulfilled the requirements specified by the Stewards and removed from the list. The Trainer of a Horse shall be notified soon after the Horse is added or removed from the list.
Okla. Admin. Code § 325:20-1-12