The most recent of five separate legal attempts within the past two years to derail the Horseracing Integrity and Safety Act (HISA) via alleged constitutionality claims hit a roadblock Tuesday when a federal judge in Arkansas denied a motion for a preliminary injunction that sought to halt HISA's oversight and its Anti-Doping and Medication Control (ADMC) program. The plaintiffs, led by Bill Walmsley, president of the Arkansas Horsemen's Benevolent and Protective Association (HBPA), and Jon Moss, the executive director of the Iowa HBPA, had asked a judge in United States...