Several new rules regarding the usage and administration of certain medications go into effect with Wednesday’s opening of Aqueduct’s inner track that figure to have a significant impact on horsemen and handicappers alike.
Beginning Wednesday, horses may not run in New York who have been administered the bronchodilator clenbuterol within 21 days. Since the rules regarding these medications vary from many of the Mid-Atlantic states, it is likely that fewer shippers will come to New York for the inner meet, likely impacting field size.
http://www.drf.com/news/aqueduct-new-me ... tion-rules