Lisa Lazarus has gotten countless calls and messages from trainers across horse racing since new medication and anti-doping rules went into effect this spring, many of which she found inspiring. “For the first time ever, they feel like they have a real chance that when they get up to the starting gate, that the playing field is really level and that they no longer have to kind of compete with other trainers’ pharmacies,” Lazarus said. Groups critical of the Horseracing Safety and Integrity Authority, of which Lazarus serves as CEO, backed competing legislation introduced Tuesday in Congress that would repeal the law and replace it with a system that gives oversight power back to states.