Ruiz was disqualified from the 1980 Boston Marathon on April 29, 1980.
Eight days following the Boston Marathon, on April 29, 1980, Rosie Ruiz was officially stripped of her title. Investigations concluded and officiating groups confirmed she had illegitimately entered the course near the finish line, discrediting her claimed completion time. This action initiated a wave of validation policies and monitoring mechanisms in marathon events globally, marking her disqualification as a pivotal moment in racing history and ensuring future sports integrity. Her disqualification not only highlighted personal morals but reshaped the framework for athletic oversight.