Thanks Errol - just what I was looking for!
"Furthermore, R-1 allows athletes to swim in their chosen category after a protest has been filed until the protest is heard by the National Eligibility Appeal Panel (a rule applying to all athletes under such protests)."
This bit is interesting - so what are the grounds for a protest, and under what circumstances would it be upheld, and how long would the process take (e.g., two years, by the end of which the promising young female swimmer bumped off, say, the state squad, may have missed her chance of selection for the national team or sports scholarships at university)?
Also interesting they illustrate it with a photo of a transman (mastectomy scars and all) - yes, we know that transmen aren't going to threaten fair competition in men's sport! It's women's sport we're worried about.