No one has ever stated or implied that Caster Semenya has been a PED cheat. Caster Semenya is more women than man naturally. Caster Semenya is equal to an above average 17 year old male, world wide. [Please do not tell me that Semenya's personal bests are faster than your high school male records.] Semenya, it has been discovered has a natural genetic advantage.
Ethiopians, those from highlands in Nepal and South American highlanders have genetic structures which makes them resistant to chronic altitude sickness. It won't take long before it is discovered that said highlanders have naturally higher VO2 &/or naturally greater ability to perform at a high level while anaerobic. How long until IAAF ban Ethiopians, 3000m to Marathon due to an unfair genetic advantage?
Is David Epstein and his Sports Gene book going to get Kenyan 800m runners from Rift Valley banned from events 800m to 3000m due to an unfair inseam to height ratio? Is David Epstein and his Sports Gene book going to get those with over 25% recent (within 500 years) west African DNA banned from 100m to 400m?
Do those with Phoenician DNA, modern Algerians, Tunisians and Moroccans have genetic advantages in 1500m?
This Semenya case is going to set legal precedent. Do IAAF not know the legal precedent they are setting? Maybe IAAF has less than benign large plans.