Caster Semenya loses landmark legal case against IAAF over testosterone levels
theguardian.com
theguardian.com
Other sports have limits for molecules like EPO, where the limit is also different between men and women: https://www.nature.com/news/2006/060224/full/news060220-18.h...
This is just different because it is about the male hormone, and now the IAAF conveniently has a metric to distinguish between men and women.
It is just case that has no easy answer. Athletic games has been held for ages, celebrating the best people in their disciplines, while at the same time discouraging people to cheat.
It turns out some people exist with natural advantages, and this advantage is just particularly controversial because it is related to gender.
For those interested there is a 50 min bbc documentary about Caster called "Too Fast to Be a Woman": https://www.youtube.com/watch?v=f-UX0LE_tCg
https://sportsscientists.com/2019/05/on-dsds-the-theory-of-t...
The claim that women would all vanish from sport is also false. Testosterone is a predictor for athletic success, but not a defining one. A few women would still compete but they would be fewer.
People have done qualitatively and quantitively studies on biological traits that correlates with success in sports, and depending on which sport it is you get different answers. Weight in some, height in others, blood values, and so on.
The article says "a person who is identical in every respect with the exception of testosterone (Athlete B) will be 10% to 12% slower than Athlete A.". The problem is that the same can be said with red blood cells. A person who is identical in every respect with the exception of lower count of red blood cells (Athlete B) will be 10% to 12% slower than Athlete A. The exact same discussion of naturally high T values exist in skiing but on the topic of naturally high Hb.