Ben Johnson, Marion Jones highlight most infamous Olympic doping cases

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Russian star Kamila Valieva is at the center of the biggest doping story of the Beijing Games after Russian newspaper RBC reported that the figure skater tested positive for a banned substance before the Olympics.

Russian athletes are competing as ROC, short for Russian Olympic Committee, at the Beijing Olympics because the country was banned for operating a state-sponsored doping scheme at the 2014 Sochi Games.

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If Valieva ends up being punished, she'd be one of the most famous Olympic athletes ensnared in a doping scandal. Here are some others:

In this Thursday, Sept. 21, 2000 file photo, Andreea Raducan of Romania, receives her gold medal in the women's all-around gymnastics competition at the Olympics in Sydney, Australia. Raducan was the women's all-around gymnastics champ when the Romanian star tested positive for pseudoephedrine, which was contained in a cold remedy she got from the team doctor.  (AP Photo/Amy Sancetta, File)

BEN JOHNSON (1988)

Probably the most infamous drug scandal in Olympic history involved Canadian sprinter Ben Johnson, marring one of the signature events of the Summer Games — the 100-meter dash. Johnson appeared to have won the race at the Seoul Games in world record time, but he tested positive for an anabolic steroid and had his gold medal taken away. It went to American rival Carl Lewis instead.

Juan Antonio Samaranch, the president of the International Olympic Committee at the time, said that penalties against Johnson and others were an indication that "we have won the battle against doping."

MARION JONES (2000)

One of the biggest American stars of the Sydney Games, Marion