The Illinois-based trainer Gerald Butler, who is currently suspended 20 months and was fined $10,000 after a Horseracing Integrity and Safety Authority (HISA)'s arbitration panel for Anti-Doping and Medication Control Program (ADMC) matters ruled in February that he possessed the banned substance levothyroxine (Thyro-L) in his Fairmount Park barn last summer, sued HISA in federal court July 3, seeking a stay of his penalties in a case that challenges the definition of the word "possession." According to the sequence of events described in the arbitrator's decision, on June 13, 2024,...