After devoting years to the difficult pursuit of perfection, some fall wayward.
The California laboratory said that no "positive test" results for steroids or other performance-enhancing drugs were found at the lab.
China's badminton superstar Lin Dan said he hopes world number one Lee Chong Wei, who is embroiled in a doping scandal, is able to return to the sport soon, state media reported.
Russian athletes are cleared to compete at next year's summer Olympics will do so without their country's flag and anthem.
Tour de France winner Alberto Contador and the Tour of Spain runner-up Ezequiel Mosquera were suspended for suspected doping on Thursday in a devastating blow to cycling's battered image. The suspensions set back the sport's efforts to restore its credibility after a string of high-profile drugs cases.
WADA is at the heart of the biggest doping scandal in years after three Russian whistleblowers went to the media and exposed a massive systematic doping scheme in the country across many sports and involving more than 1,000 athletes.
Russia could be banned from international athletics, including the 2016 Olympic Games, after an anti-doping commission report on Monday alleged widespread corruption and collusion that added up to a state-sponsored drugs culture in a sporting superpower.
Russian athletics was back on top of the medal table at the European Indoor Championships.
Presidents are limited to two terms in office under the rules of the Olympic body. The length of the first presidential term is eight years with re-election securing another four years in office.
The BBC report said a third of medals in endurance events at the Olympics and world championships between 2001 and 2012 were won by athletes who have recorded "suspicious tests".
Sushil, who is yet to make a formal statement on the matter, put out a cryptic tweet after the controversy broke out.
The scandal revolves around accusations that money was demanded from top athletes to 'bury' medical tests showing drug use
Disgraced former Tour de France winner Jan Ullrich admitted that he underwent blood-doping procedures under the guidance of a Spanish doctor at the heart of a major drugs scandal.
A report by the World Anti-Doping Agency on Monday is set to deepen an athletics scandal that, according to one of the document's authors, eclipses even the alleged corruption at football's governing body FIFA.
Ukraine on mission to ban Russia from Paris Olympics
American Ursula Papandrea will continue to lead the sport's governing body as Acting President.
Narsingh Yadav's hopes of competing in the Rio Olympics appeared bleak after he failed a second dope test, which was conducted on his samples on July 5.
Six-time Olympic gold medallist Usain Bolt won the men's 100m at the World Athletics Championships, breezing home in 9.78 seconds in Moscow on Sunday night. Justin Gatlin of the United States was second in 9.85 seconds while and Nesta Carter of Jamaica was third in 9.95.
Narsingh Yadav's chances of making it to the Olympics will be known on Thursday. The National Anti-Doping Agency's disciplinary panel adjourned its hearing on the dope scandal surrounding the wrestler on Wednesday evening, even as he failed a second dope test and lodged a police complaint against two fellow-grapplers.
The corruption scandal that has rocked athletics is worse than the one that has plunged soccer body FIFA into crisis because it punished clean athletes, four-times Olympic gold medallist Michael Johnson said on Tuesday. "With athletics, if you think about the victims, it is absolutely worse," the 400 metres world record holder told BBC radio. "The victims here are those (clean) athletes. They never had the opportunity to stand on the podium and they should have," added the American sprinter. An independent commission of the World Anti-Doping Agency (WADA) has stated in a damning report that "corruption was embedded" at the International Association of Athletics Federations (IAAF).
Looking at the response time, brands are proactively snapping ties with celebrities in the face of controversy.
The Indian wrestling contingent were hit with a doping scandal ahead of the 2016 Rio Games, which resulted in freestyle medal contender Narsingh Pancham Yadav being disqualified just days before his scheduled opening bout.
Speaking to Reuters during a WADA meeting in Lausanne, Switzerland, Tygart said as long as sports bodies were represented on WADA, the anti-doping organisation could not deliver on its promise to crack down on cheats.
An Italian court indicted former Giro d'Italia winner Damiano Cunego and 26 others on doping charges involving his Lampre-Merida team on Friday, in a new blow for a sport dogged by drug scandals.
IAAF chief Sebastian Coe has reportedly made the comment because Kenya, which topped the medals table at the 2015 world championships in Beijing, has had more than 40 athletes banned for doping in the past three years
'If you try to use every resource that you have, you won't feel like you've let yourself down. Don't think because wherever you came from that you cannot be successful. No matter if you make an Olympic team, you gave your heart and you put your heart out there to be as successful as you could be.'
'If you take me back to 1995, when doping was completely pervasive, I would probably do it again' 'When I made the decision (to dope in 1995), when my team made that decision, when the whole peloton made that decision, it was a bad decision and an imperfect time'
Australia's 2011 Tour De France winner Cadel Evans has admitted meeting the Italian doctor at the heart of the Lance Armstrong scandal more than a decade ago but said they never discussed doping.
Overcoming the dope scandal, which almost derailed his hopes of competing at the Rio Olympics, wrestler Narsingh Yadav said he would want to forget about the toughest phase of his life and solely focus on winning a medal on August 19. Narsingh reached Rio de Janeiro along with India's chief coach Jagminder Singh and checked into the Games Village.
The Indian hockey team management organised a special session for the players in the just-concluded national camp in Bangalore to create awareness about corruption in the wake of the recent spot-fixing scandal in IPL 6.
Justice Mukul Mudgal, who was appointed by the sports ministry to probe into the athletics doping fiasco, today said that jailed Commonwealth Games organising committee officials Suresh Kalmadi and Lalit Bhanot may be questioned in connection with the scandal.
Bach said Tokyo was 'the best-prepared Olympic city,' in remarks at the start of a three-day virtual IOC session.
Winter Games' least taxing and physically demanding sports feel it necessary to use performance-enhancing drugs
Brazil's athletes were not subject to dope tests for almost a month before the Rio Olympics, the country's sports ministry has said while refuting allegations it was a political decision to ensure the Games were not plunged further into crisis.
Russian drug cheats will be competing at next month's Rio Olympics, the whistleblowers who helped uncover the country's doping scandal have told the BBC.
Russia still has a shot to compete in the athletics competition at the 2016 Olympics if they can prove they are drug free, the head of a probe into the country's doping scandal said on Tuesday.
Barred from international competition, Russia is training its athletes at a series of special domestic tournaments and banking on hopes a doping ban will be lifted in time for this year's Rio Olympics.