People like to believe their favourite sports are clean. Some sports are considering "druggy" like cycling and baseball. Fans of sports where it has not been completely unearthed simply won't believe it. I find it easy to say but hard to internalise myself.
As mentioned elsewhere there's been a fair amount of rug sweeping in football (Spain, Italy, UK libel laws quoted against investigative journalists, Chelsea blood spinning) and plenty of incentive to keep it looking clean. But none of that is specific to Leicester.
The article I quoted was about a doctor drugging hundreds of atheletes and he named Leicester in the undercover sting. That's what I was getting at. He could be the reason for their success.
As mentioned elsewhere there's been a fair amount of rug sweeping in football (Spain, Italy, UK libel laws quoted against investigative journalists, Chelsea blood spinning) and plenty of incentive to keep it looking clean. But none of that is specific to Leicester.