7 Pa. Code § 305.36 – Stewards’ List.

(a) The Stewards shall maintain a Stewards’ List of the horses which are ineligible to be entered in a race because of poor or inconsistent performance or behavior on the racetrack that endangers the health or safety of other participants in racing.
(b) The Stewards may place a horse on the Stewards’ List when there exists a question as to the exact identification or ownership of said horse.
(c) A horse which has been placed on the Stewards’ List because of inconsistent performance or behavior, may be removed from the Stewards’ List when, in the opinion of the Stewards, the horse can satisfactorily perform competitively in a race without endangering the health or safety of other participants in racing.
(d) A horse which has been placed on the Stewards’ List because of questions as to the exact identification or ownership of the horse, may be removed from the Stewards’ List when, in the opinion of the Stewards, proof of exact identification or ownership, or both, has been established.
(e) In addition to any penalties imposed upon any owner, trainer, veterinarian or other licensee as a result of a medication or drug positive, after notice and an appropriate hearing, the horse which tested positive for the prohibited substance, shall be placed on the Stewards’ List and shall be ineligible to participate in racing for the following period of time:
1. (1) For Class 1 or Class 2 drugs (as set forth in the Association of Racing Commissioners International Uniform Classification guidelines) the horse shall be ineligible to race for a period of 90 days from the date of the Stewards’ ruling, unless the matter has been appealed to the Commission.
2. (2) For Class 3 drugs or high blood gas (TCO2) readings the horse shall be ineligible for a period of 30 days from the date of the Stewards’ ruling, unless the matter has been appealed to the Commission.