Questions and Answers on the Olympic doping retests

LONDON (AP) — The IOC announced Tuesday that 31 athletes in six sports and from 12 countries could be banned from the Olympics in Rio de Janeiro after their doping samples from the 2008 Beijing Games came back positive in retests.
Some questions and answers about the latest doping scandal in sports:
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Q: How can athletes be caught for doping so many years later?
A: The International Olympic Committee keeps all Olympic doping samples for possible retesting. Samples are frozen and stored a