(a) The stewards and racing judges may require a specimen of hair, urine, blood, saliva, tissue or other bodily substance to be taken from a race animal for the purpose of testing for the presence of a prohibited drug, chemical, or other substance.(b) Testing under this subchapter may be required at any time in accordance with these rules and may be conducted in an area approved by the commission veterinarian under the supervision of the commission veterinarian.(c) A person is not entitled to a purse until drug testing has been completed and the executive director has cleared the race for payment.