Since the London Games, 40 Kenyans have been banned, all bar five caught outside their home country.
Russia is facing charges of four gold medallists using steroids at the Sochi Games; there are claims urine samples were switched to avoid detection in the cases of 15 drug-using medal winners.
Wada claims only 10 doping control agents are available to conduct tests throughout Russia.
It's a shambles and Rio is fast approaching. It's tempting to say, get shot of them. But that hurts the clean and honest athletes. Unfortunately in this case, it may just be tough.
Cricket has always been strongly identified with its best commentators.
If you are of a certain age, you'll remember listening to Alan McGilvray and Lindsay Hassett in the 1960s, coming through the radio from the Sydney Cricket Ground on those waves of background hum. Richie Benaud came later, perhaps the most distinctive voice in sport, and the top-class Jim Maxwell.
England had Brian Johnston, a japester alongside the likes of Fred Trueman and John Arlott, the immensely versatile Christopher Martin-Jenkins, and nowadays there is Jonathan Agnew.
New Zealand's Bryan Waddle is among the game's best ball-by-ball callers; India has the enthusiastic Harsha Bogle. And the West Indies had Tony Cozier.
He died this week at his home in Barbados, after a short illness from complications surrounding infections in his neck and legs. He was 75 and had been behind a microphone since Australia's tour of the Caribbean in 1965.
Cozier's voice was as distinctive as that of any of those other broadcasters. He savoured the highs of West Indies domination of the game, felt keenly the lows but with the West Indies administration in a shambles, and playing standards tumbling, Cozier was never afraid to call it as he saw it. No soft soaping.
He had the gift of being able to slip seamlessly between TV and radio ball-by-ball commentary. Not easy. As Agnew, the BBC correspondent, put it: "He was easily the best I've come across in 25 years at being able to do both disciplines."
Cozier is a substantial loss to the cricket commentary corps. In a sense he was West Indies cricket.