The United States Anti-Doping Agency (USADA), for years a vocal proponent of federal legislation to bring the sport under a single governing entity, announced in a press release Thursday morning that it has been unable to reach an agreement to become the enforcement agency for the Horseracing Integrity and Safety Authority, the broad non-profit umbrella established by the Horseracing Integrity and Safety Act. "After months of negotiations, we have been unable to enter an agreement in line with the requirements of the Act, and one which would have given us...