The NCAA, the governing body for college/university sports in the US, allows males who supposedly identify as the opposite sex to compete in women's sports without requiring them to provide any ID documents or other evidence that their claimed identity is sincere. Nor does it require males to lower their T to any particular level.

The NCAA policy says only that a male must have taken medication to lower his testosterone in the 12 months prior to beginning to compete in women's sports. Not take medication for 12 months, just to take medication in the preceding 12 months. A man would be in compliance with the NCAA policy is he took a single estrogen pill during the 12 months prior to his first women's event. The NCAA doesn't check T levels or require that athletes provide lab work of their own. Coz no one would ever lie, presumably.

In many states in the US, teenage high school boys in the throes of puberty or well past it are allowed to compete in girls HS sports without taking any medication to lower their T. That's the case in Connecticut, where two strapping male teenagers, Terry Miller and Andraya Yearwood, ran in - and dominated in - girls sprints starting when they were 15, without either of them taking any T suppressants or cross-sex hormones. Their attorney revealed in court in 2020 that Miller and Yearwood did finally start taking "gender affirming hormones" of some sort, but by then the two athletes were already 18 and their HS track careers were finished.