Draft rules for the Horseracing Integrity and Safety Act (HISA) were unveiled Thursday morning, broad details of which can be read here. As expected, these draft rules aren't full and comprehensive, and are subject to revision. Nevertheless, as currently written, they signify a fundamental revision to the way the industry is policed, including a markedly more stringent approach to medication violations. To discuss these rules, the TDN sat down Wednesday afternoon with United States Anti-Doping Agency (USADA) CEO Travis Tygart and Dr. Tessa Muir, head of the agency's equine program....