C-72.1, r. 4 - Rules respecting Standardbred horse races held at a professional race track

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55. Where a horse is sold, neither the horse’s owner, the agent of that owner nor the horse’s trainer may cause it to participate in more than 1 race from the time of the sale until the change of ownership has been made on a registration certificate by the Canadian Standardbred Horse Association or the United States Trotting Association, as the case may be, unless the new owner, his agent or the trainer demonstrates to the racing judges that the documents necessary to give notice of that change have been forwarded to one of those organizations.
Decision 90-09-19, s. 55.