Why was Rosie Ruiz stripped of her victory in the 1980 Boston Marathon?

Answer She only ran the last quarter-mile of the race.

After Ruiz finished with a record-setting time and without having broken much of a sweat, race officials — as well as other runners — began to suspect Ruiz of foul play. The fact that Ruiz didn't remember her splits or intervals and that race leader Jacqueline Gareau never saw Ruiz pass her didn't help Ruiz's story. Gareau was later instated as the true winner.

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