When Dr. Barbara Hippie drove through the backstretch gates at Mahoning Valley Race Course last September, she knew she had some substances and medications on her truck that were banned by the Horseracing Integrity and Welfare Unit (HIWU). But she said she thought she had no reason to worry. She said she knew the banned medications were not to be used with any covered Thoroughbred racing or training at an Ohio racetrack. Hippie, part of a three-person practice based in Chagrin Falls, Ohio, has a vast practice and treats many...