Sensational media reports of widespread blood doping in world athletics has also pointed the finger of suspicion at Indian athletes, though experts in the country are not very clear about how it could have happened.
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.
Russian tennis star Maria Sharapova, the highest-paid woman in sports, said on Monday that she failed a drug test at the Australian Open due to a substance she has been taking for 10 years for health issues.
Pakistan Cricket Board on Tuesday suspended beleaguered pacer Mohammad Asif for flunking the dope test during the Indian Premier League and promised to extend all help to IPL Drugs Tribunal in its enquiry into the matter.
The situation of Russian tennis star Maria Sharapova is "bad" after she tested positive for the banned substance meldonium and she may never play again, R-Sport news agency quoted Shamil Tarpishchev, the president of the Russian Tennis Federation, as saying.
Testers were also routinely obstructed from gaining access to athletes who used military cities as the location for their whereabouts knowing doping control officers would need special permission to gain access. The WADA update also revealed several examples of widespread efforts to avoid testing, including one detailed instance where an athlete tried to use a container inserted inside her body that presumably contained clean urine.
Jamaica's Olympic sprint champion Usain Bolt has "no problem" with plans by the World Anti-Doping Agency (WADA) to test the hair follicles of athletes in a bid to clamp down on drug cheats in sport.
Summary of sports events and persons who made news on Wednesday
'We are trying passionately to protect those clean athletes who are going to Rio 2016'
Russia has named a track and field team for the Rio Olympics which includes gold medallists Yelena Isinbayeva and Ivan Ukhov among 68 athletes who are hoping an IAAF ban on them competing will be lifted by sport's highest court later this month.
The Central Bureau of Investigation (CBI) registered a case in the doping scandal involving international wrestler Narsingh Yadav, who was barred from participating in the Rio Olympics after banned substances were found in his urine samples.
Independent investigators found that the World Anti-Doping Agency behaved in ways "completely inconsistent" with testing rules.
Russia has lost its appeal against its ban from next month's Rio Paralympics because of a state-sponsored doping programme, the Court of Arbitration for Sport (CAS), sports highest tribunal, said on Tuesday. The decision to exclude Russia's entire Paralympics team, initially made on Aug. 7 by the International Paralympic Committee (IPC), means at least 250 Russian competitors are set to miss the Sept. 7-18 event.
The IOC seems reluctant to ban the entire Russian team from next month's Olympic Games, despite mounting concern over doping violations, the co-author of the report that led to Russia's ban from track and field events said on Wednesday.
Documents relating to Farah, and published on the fancybear.net website, showed that the distance runner had no active Therapeutic Use Exemptions (TUEs) at the time of the Olympics. TUEs allow athletes to take banned substances for verified medical needs and there is no suggestion any of those named have broken any rules
Summary of sports events and persons who made news on Friday
Maria Sharapova's lawyer blasted WADA chief Craig Reedie for making remarks about the five-times grand slam champion at a conference in London on Monday and said the Russian tennis player was owed an apology.
Leading sports powerbrokers gathered at the International Olympic Committee's headquarters on Tuesday morning to discuss further crackdowns on drug cheats before the Rio Games.
The Bulgarian teenager has been banned for two years for doping, the International Tennis Federation said.
Croatia clinched a place in next year's World Cup finals on Sunday after holding Greece to a goalless draw at the Georgios Karaiskakis stadium in Athens to complete a 4-1 aggregate victory in their playoff tie.
Five-times Grand Slam champion Maria Sharapova has criticised the International Tennis Federation (ITF) for not doing enough to make her aware that meldonium had been added to the list of banned substances last year.
In its report WADA was scornful of the ATP's inconsistent disciplinary process covering the seven cases.
Hungarian Olympic discus champion Robert Fazekas will lose his gold medal and be expelled from the Games after breaking doping rules.
Caeleb Dressel lit up the pool by winning his fourth, fifth and sixth gold medals on Saturday but even his electric performance failed to brighten the mood on a dark day at the world swimming championships in Gwangju.
A summary of sports events and persons who made news on Monday
The former Czech No. 1, who tested positive for nandrolone, was also fined $43,770 and had 100 ranking points deducted.
The Board of Control for Cricket in India treasurer Aniruddh Chaudhry has questioned COA member Diana Edulji benefitting from a one-time ex-gratia payment given to women international cricketers, implying conflict of interest in the allocation.
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".
India's double-Olympic medal winning wrestler Sushil Kumar, on Saturday, conceded that he has met top officials of the WWE but ruled out any immediate move to professional wrestling.
This and more from the happenings in the world of football
Russian long jumper Darya Klishina has been cleared to compete internationally as a neutral athlete after a successful appeal against a blanket ban on her country's track and field athletes for systematic doping.
Australian Olympic champion rower Kim Brennan has spoken of her deep disappointment that her integrity as a clean athlete has been called into question over a shot of adrenaline administered in a medical emergency.
Russia said on Friday it is ready to do everything from a legal point of view to defend Russian athletes if they are banned from taking part in the Rio Olympics over doping allegations.
While handing down a four-year ban on Narsingh Yadav, the Court of Arbitration for Sports has ruled that the wrestler failed to produce any 'real evidence' regarding the sabotage theory he had advanced and the balance of probabilities was that he orally took the banned substance intentionally in tablet form on more than one occasion.
Chinese Olympic women's swimmer Chen Xinyi tested positive for a banned substance at the Rio Olympics on August 7, state media said on Friday citing the country's swimming association, the latest doping scandal to mar competition at the Games.
The alleged conspiracy in the Narsingh Yadav dope scandal began to unravel, on Wednesday, with the wrestler identifying two fellow grapplers as the saboteurs, who contaminated his food with a banned steroid, in a formal police complaint.
Cardiff had lost six of their previous seven games but, knowing that anything but a victory would probably end their survival hopes after one season in the top flight, overcame a strong Brighton start to play with growing confidence and fully deserved their victory.