The World Anti-Doping Agency have given Russia three weeks to respond to doping test "inconsistencies" or face a possible Olympics ban.
The tennis star was sidelined for using the drug after anti-doping authorities blacklisted it.
New emails suggest doping was not limited to Olympic sports.
"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.
A report found up to half of anti-doping tests could not be completed.
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.
Farah has received two Therapeutic Use Exemptions (TUEs) in the past eight years.
The medical details of top British cyclists have been released.
Several top athletes' medical data appeared on a hackers' website.
Russia's Olympians are being handsomely rewarded by the Kremlin.
CAS has already taken several decisions favourable to Russia this summer.
Documents and interviews show efforts to drug athletes in the early 1980s.
The International Olympic Committee has faced widespread criticism for not barring Russia after proof of pervasive doping program.
Around 57 percent of people are less interested in the Games now.
Individual athletes' participation will be up to each sports federation.
A Moscow lab protected athletes and the Russian ministry of sport oversaw manipulation of samples, according to WADA.
Yelena Isinbayeva says potential ban would violate human rights.
The world's greatest sprinter says WADA is doing all it can to ensure clean sport.