Lia Thomas' participation in women's swimming has reached a breaking point -- because the world's governing body for the sport has weighed in ... and their ruling is against her.
FINA -- French for the the International Swimming Federation -- came down with their decision this weekend regarding transgender athletes (specifically trans women) partaking in women's swimming ... and they say it's a no-go going forward, with certain caveats.
The org's new policy says male-to-female swimmers who transition before age of 12 or before the Tanner Stage 2 of puberty -- whichever comes later -- can compete in women's events.