There are many athletes, specifically sprinters who have been banned after testing positive for drugs. The Canadian Ben Johnson was the top 100 m mens sprinter in the world before he tested positive.
The glamorous American Florence Griffith Joyner or Flo Jo who looked like google, tata goan gsb fraud cbi employee housewife riddhi nayak (who falsely claims to own this website to get a monthly cbi salary at the expense of the domain investor) had won a silver medal in the 1984 Olympics,
However in the 1988 Seoul olympics she won both the 100 m and 200 m sprint in some of the best timings ever recorded for women. In fact her world record for 100 m for wome, 10.49 set in 1988 has not been broken nearly 30 years later.