[Hoot Gibson]

How would you enforce it?

Using a simple chromosome test if the sex listed on the birth certificate is missing or challenged. Males compete as males and females compete as females. It is a simple concept that has worked for many centuries.

Why not just show your Birth Certificate, it would be the easiest and cheaper way.

Why did you ask your question if you understand how simple enforcement will be? 

However, there may be some jurisdictions where the lunatic left has managed to have an infinite number of genders available as options, or the sex omitted from birth certificates. In those cases, a chromosome test may be required.

Again, there is a copy of the ORIGINAL CERTIFICATE IN EACH STATE put it in the bill Original Birth Certificate=NO PLAY.
This stunt is nothing but a political ploy that's all it is.
You want people to take a test do you want all the participants take the test or just the one you want to take the test. Looks to me you are opening yourself up to a lot of lawsuits. At a cost of $100 to $2,000 a test that could run into a lot of money not counting the lawsuits if you don't include all of the participants. Would be simple to add 5 words to the bill. But it's just a political stunt.
And we come back to the problem MAGA had with taking the vaccine Big Government telling me what to do with my body.

What is the cost of genetic testing, and how long does it take to get the results?: MedlinePlus Genetics

You need to work on your reading comprehension. I suggest you start by rereading my post. Chromosome testing would be done only to settle disputes.

Do you support biological males competing against biological females or not? Simple question that requires a simple answer. Currently, boys are competing against girls and shattering women's records, so the current system is broken, in the opinion of most fair-minded Americans. Choose a side.