China's Olympic swimming champion Sun Yang has his career ended for breaking anti-doping rules.

CGI showing space-filling three-dimensional molecular model of methyltestosterone, an anabolic steroid

Soccer Doping

Drug Addict Cutting Cocaine Lines

Madrid, 8 Feb (EFE) (Camera: Enrique del Viso).- Saxo Bank's Spanish cyclist Alberto Contador, banned for the next two years for a doping offence at the 2010 Tour by the Court of Arbitration for Sport (TAS), holds a press conference to...

Madrid, 8 Feb (EFE) (Camera: Enrique del Viso).- Saxo Bank's Spanish cyclist Alberto Contador, banned for the next two years for a doping offence at the 2010 Tour by the Court of Arbitration for Sport (TAS), holds a press conference to...

Madrid, 8 Feb (EFE) (Camera: Enrique del Viso).- Saxo Bank's Spanish cyclist Alberto Contador, banned for the next two years for a doping offence at the 2010 Tour by the Court of Arbitration for Sport (TAS), holds a press conference to...

CLEAN: Interior shots of athletes from the British Cycling World Class Performance Programme training in the velodrome at the National Cycling Centre on March 02, 2017 in Manchester, England

CLEAN: Interior shots of athletes from the British Cycling World Class Performance Programme training in the velodrome at the National Cycling Centre on March 02, 2017 in Manchester, England

CLEAN: Exterior shots of Nicole Sapstead, Chief Executive of UK Anti-Doping arriving at Portcullis House before giving evidence to the Culture, Media and Sport Select Committee on the investigation into the contents of a medical package...

1. Wide of criminal court room

2. Close-up former US cyclist Tyler Hamilton on TV s
creen
3. Wide of criminal court room with Tyler Hamilton in
the screen
4. Wide of photographer shooting at the TV with...

CLEAN : Olympics: Rio's glittering opening launches Olympics

File photos of Russian figure skater Kamila Valieva training as she was on Monday cleared by the Court of Arbitration for Sport to continue competing in the Beijing Olympics despite failing a doping test (Footage by AFPTV via Getty Images)

Women exercising with weights in gym

Hartpury College men's rugby team training

Hartpury College rugby team training

Anti doping poster and woman weightlifting in gym

Russian Olympic base in Rio de Janeiro

CLEAN : Olympics: Malaysias Lee on quest for badminton redemption

CLEAN : Rio 2016: Rio control lab to test athletes for doping

CLEAN: Exterior shots of the Stratford former Olympic Stadium with crowds of sports fans arriving to watch the World Athletics Championships

The Swiss firm that manufactures the Winter Olympics anti doping kits opened the doors of its factory on Wednesday promising that its bottles will be impossible to manipulate

A Slovenian hockey player has become the third athlete to test positive for doping at the Pyeongchang Olympics.

The Court of Arbitration for Sport says Ziga Jeglic tested positive for fenoterol in an...

CLEAN: Exterior shots crowds arriving at the Olympic Stadium for the World Athletics Championships 2017, walking, shot from behind, stadium in view, diverse ethnicities, all ages in Stratford, London, England on Saturday 5th August 2017.