It will be a huge hurdle, especially to lower income girls. You think these checks will be free or covered by insurance? Not to mention reinforcing that your body is shameful and must be inspected for 'purity' for others.

I was a shy kid but loved playing sports, I know for a fact I would never play another day of sports in my life if in lived under these rules.

Sir, this is Taco Bell The Needling, Seattle's Only Real Fake News

Edit: .......wait, this is a real bill though? Look, these Onion flavored articles are getting too real. Its unironically getting difficult to tell when theyre joking and not.

Not to take too serious of a turn on all this, but I remember as a young boy needing to get a physical every year to do sports, which included the doc needing to feel something on my scrotum while I turned my head and coughed. I always imagined the girls needing to have something comparable checked.

Would this bill drive a more invasive test than that?

Edit 2: according to Ballotopedia:

The ballot initiative required students seeking to participate in athletic activities designated for female students to submit documentation from their healthcare provider verifying "the student’s biological sex [based on]... reproductive anatomy, genetic makeup, or normal endogenously produced testosterone levels."[

However, the link to the citation appears to be broken

Practically, probably very little. Seattle schools has already filed a lawsuit, and it seems pretty unlikely to be upheld by the Washington Supreme Court because it pretty clearly violates equal protection by gender under the law.

The actual answer is because karyotype testing (testing of biological sex determinations) results in a whole bunch of cis people discovering that they are intersex.

Similarly to why they stopped doing eye color punnit squares in schools, because there are a few more factors in eye color and it was leading to kids thinking they were the result of an affair. Any time there is a test that would uppend the life of the person being tested for no real good reason, we err on the side of not causing a problem if we don't need to.

Should go without saying, but this test should also be included in that, and genital testing should never be a requirement for something as low stakes as sports. We don't test for hyperflexibility, naturally high T levels, or any other genetic advantage someone could have, and any "advantage" a trans person could have (which has never been proven in any scientific study) pales in comparison to the natural advantage some cis people have over other cis people.