1. (a) Except as otherwise authorized by Commission rules:

   1. (1) No Horse carrying a Prohibited Substance or the Metabolite of a Prohibited Substance in its body shall be brought within the Enclosure, entered into a Race, or participate in a Race;
   2. (2) No Horse carrying a Permitted Substance in its body with a concentration exceeding listed thresholds shall participate in a Race; or
   3. (3) No Horse carrying a Naturally Occurring Substance in its body with a concentration exceeding the concentration such Substance could occur naturally shall participate in a Race.
2. (b) Any Substance that masks or screens the presence or concentration of Prohibited Substances, Permitted Substances, or Naturally Occurring Substances; or prevent or delay testing procedures shall be considered a Prohibited Substance.

Amended at 10 Ok Reg 4731, eff 9-28-93 (emergency)

Amended at 11 Ok Reg 3195, eff 6-27-94

Amended at 16 Ok Reg 3307, eff 7-26-99

Amended at 20 Ok Reg 1231, eff 5-27-03

Amended at 23 Ok Reg 2071, eff 5-9-06 (emergency)

Amended at 23 Ok Reg 2594, eff 6-25-06

Amended at 26 Ok Reg 808, eff 4-25-09

Amended at 35 Ok Reg 347, eff 12-18-17 (emergency)

Amended at 35 Ok Reg 1535, eff 9-14-18

Amended at 41 Ok Reg, Number 23, effective 8-25-24

Amended at 42 Ok Reg, Number 21, effective 7-26-25