Printer-friendly version QUARTER HORSE DIRECTIVE No. 1 – 2012 Enhanced Testing for Clenbuterol QUARTER HORSE DIRECTIVE No. 2 – 2012 RULES OF THOROUGHBRED RACING 2009 – Quarter Horse Appendix QUARTER HORSE DIRECTIVE No. 3 – 2012 RULES OF THOROUGHBRED RACING 2009 – Quarter Horse Appendix ‹ Quarter Horse QUARTER HORSE DIRECTIVE No. 1 – 2012 Enhanced Testing for Clenbuterol ›