"Nothing is set in tablets of stone," said Sebastian Coe. "You adapt and occasionally reassess."
"We certainly have to respect the role of the U.S. Anti-Doping Agency and the U.S. Olympic Committee and the decisions they make, but it is sad," Psaki said on Wednesday.
Until now, it has not been clear whether or not Richardson might be able to compete as part of the women's 4x100 meter relay pool.
McNeal was handed a five-year suspension, which, if upheld, will ban the hurdler from competing in Tokyo this summer and Paris in 2024.
A three-year-old first-place winning greyhound was discovered to be doped up on significant amounts of methamphetamine, according to a post-race urine test. Now, New Zealand's entire dog racing industry is under review.
The World Anti-Doping Agency have given Russia three weeks to respond to doping test "inconsistencies" or face a possible Olympics ban.
"Wow dude you're a real bad ass," tweeted Donald Trump Jr. "Did you need to use steroids this time too, or was that just to cheat others out of wins throughout your career?"
Grigory Rodchenkov lifted the lid on Russia's state-sponsored doping program, before fleeing into the FBI Witness Protection Program in the U.S.
Bryan Fogel's new film, "Icarus," premieres on Netflix on August 4.
The U.S. Tennis Association has to decide if it will give the disgraced tennis star wild card entry.
The Canadian is a fierce critic of Sharapova, saying the Russian should not have been welcomed back to tennis after her doping ban.
The tennis star was sidelined for using the drug after anti-doping authorities blacklisted it.
"We are now able to confirm a cover up that dates back until at least 2011," said McLaren.
Anti-doping has become an arbitrary process, so why not change the rules?
Coaches and doctors that turn athletes to doping could face probation and jail.
Steven Colvert tested positive for blood-booster EPO in 2014.
International Olympic Committee agrees to give WADA an expanded role in the wake of international doping scandals.
'Fancy Bear' has been releasing details of athletes' Therapeutic Use Exemptions.
Sharapova can return on April 26.
Froome's former team mate Sir Bradley Wiggins has been caught up in the controversy.
Wiggins has been under pressure to explain his use of corticosteroids.
Alleged Russian hackers have released confidential data of U.S. and U.K. athletes, including Bradley Wiggins and Venus and Serena Williams.
Mikhail Terentyev says if rules stop clean athletes from playing, change the rules.