The Supreme Court is being asked, via its shadow docket, to rule on K.M.K. v. Washington Interscholastic Activities Association, a case that could effectively bar trans women from women's sports teams in every US state, including states that have chosen inclusion. The case is built on contested legal arguments from the Alliance Defending Freedom and centres on a sexual assault allegation that prosecutors declined to pursue. The real question underneath the fairness framing is whether trans women belong in public life at all.

What is actually being decided here?

The framing around this case does a lot of work to obscure what is at stake. The plaintiffs, represented by the Alliance Defending Freedom, a Christian right law firm, are not simply asking whether one particular policy in Washington state is lawful. They are asking the Supreme Court to establish that no state may permit trans women to compete on women's sports teams, regardless of what the people of that state have decided. That is a sweeping federal override of democratic choices made at state level, and it is being pursued through the shadow docket: a process designed for urgent, indisputable matters, not novel constitutional questions that the Court's own recent decisions have explicitly left open.

A few months ago, in West Virginia v. B.P.J., the Court held that it was not deciding whether schools may allow trans women to participate in women's sport. That was a deliberate deferral. Now the same Court is being asked to leap over that gap at speed, without full briefing, without oral argument, and on the basis of a case where the central factual allegation, that K.M.K. was sexually assaulted by her trans opponent during a wrestling match, was investigated by prosecutors who concluded they could not prove a crime was committed. The referee who officiated the match said nothing stood out to him, and that reviewing video he could not say the hand placement was anything out of the ordinary. The school district's investigation is still ongoing.

None of that means K.M.K.'s experience should be dismissed. If she felt something happened to her, that deserves to be taken seriously. But there is a very large distance between taking an allegation seriously and using it as the factual foundation for a national legal ruling that will affect every trans woman who wants to compete in any school or university sport in America. The ADF knows what it is doing. This case was chosen because the allegation makes it radioactive to defend, and because speed through the shadow docket reduces the time available for careful legal scrutiny.

The fairness argument and the question it is really asking

The word "fairness" is doing enormous work in the public conversation around trans women in sport, and I want to ask what it is actually doing.

Fairness in sport is a genuinely complex question. Bodies differ. Training histories differ. Access to coaching, nutrition, and equipment differs. Sport has never been a level playing field in any simple biological sense, and it has never tried to be. What sport does try to do is create meaningful competition within categories, and those categories are set by humans, revised by humans, and always contested by humans. Caster Semenya has higher natural testosterone than most women. Eero Mäntyranta had a genetic mutation that gave him exceptional oxygen-carrying capacity. Michael Phelps has a wingspan and a lactic acid threshold that most swimmers will never approach. We do not ban people who fall outside the average. We make decisions about where to draw lines, and those decisions are always value judgements, not scientific facts.

So when someone says trans women in sport is a question of fairness, I want to ask: fairness as measured how, over what distance, in which sport, at which level? And more importantly, fairness for whom, set against what other values? Because the answer to "passing as what?" when someone says a competition should be "fair" often turns out to be: passing as a space where trans women are not present.

That is not a fairness argument; it is an exclusion argument presented as one.

What the legal arguments actually say

The ADF makes two main claims. The first is that Title IX, the federal law barring sex discrimination in schools, implicitly requires sports teams that only cisgender women may join. The second is that the Court's recent Mirabelli ruling, which requires schools to out trans students to their parents, also requires schools to exclude trans women from women's sport.

The first argument has already been acknowledged as unsettled by the Court itself. The second is being stretched from a single paragraph of reasoning about parental rights into a sweeping prohibition on trans participation in sport, which is not what Mirabelli said or decided. These are novel arguments. The Court's own precedents do not establish them as indisputably clear, which is the standard required before a shadow docket injunction should be granted.

There is also a genuinely alarming risk buried in the ADF's legal theory: one reading of their argument, if taken to its logical conclusion, could make it impossible for any school athlete, cis or trans, to participate in competitive sport at all. That is not a hypothetical concern raised by trans advocates. The Vox analysis of the case identifies it as a real possibility, and it illustrates exactly why novel legal arguments deserve full deliberation rather than rushed shadow docket treatment.

Do trans women belong in public life?

I keep returning to the question underneath all of this, because I think it is the one we are actually being asked to answer, even if it is never put that plainly. Sport is a public space. Women's sport is a public space for women. Trans women are women. So the question of whether trans women belong in women's sport is, at its core, the question of whether trans women belong in public life alongside other women, or whether their presence is always and inherently a problem to be managed, limited, and eventually excluded.

Every time a court, a legislature, or a governing body answers that question with a ban, it answers the deeper question too. And the people who bear the cost of that answer are not abstractions. They are real women, some of them teenagers, who wanted to run or wrestle or swim with their peers, and who are being told, at speed, by a court acting without full argument, that they cannot.

The Court may yet decide that this is a question for states, not for federal judges, just as it did with abortion. I hope it does. Not because I think states banning trans women from sport is good, but because the alternative, a sweeping national ruling handed down through the shadow docket on disputed facts and novel legal theory, would be worse. And because a ruling that respects state authority at least leaves open the possibility of states choosing differently, as Washington has.

What I know is this: trans women did not choose to become a political battleground. They chose to play sport. That deserves to be remembered.

If there is a news story you would like me to cover then just let Sammy know.

Dr Helen Webberley is a Gender Specialist, Medical Educator, writer, and advocate, and the founder of GenderGP. She writes about gender diversity, trans healthcare, and the lives at the centre of both.