Since last summer, the New York Racing Association (NYRA) has trialed on thousands of runners a discreet sensor technology capable of detecting minute changes in a horse's gait at high speed. Called StrideSAFE, the biometric sensor mechanism slips into the saddle cloth and works like a traffic light signal, providing a green for all-clear, an amber for possible warning (light amber better than dark amber), and a red for possible danger. The ultimate aim of StrideSAFE--a focus of discussion during the recent Grayson-Jockey Club Research Foundation Welfare and Safety of...