Arbitrator concludes no fault violation for US swimmer Calista Liu, believes contamination came from sheets and pillows

8. Ms. Liu no longer lives with her father having moved out of her family home in September 2022 aged 16, but for the past two years she has regularly visited him at her family home a few nights per month. Ms. Liu further explained that on many of these visits since her father began using his dorzolamide eyedrops, she would lie on her father’s bed to talk and spend time with him each evening beginning around 8:00 p.m. and would stay on his bed from 30 to 90 minutes at a time, during which time she would have contact with her father’s pillows and bedding.13 When reacting to a funny or emotional story or video she shared with her father, which was not uncommon, Ms. Liu would sometimes press her face into the pillow while laughing.14 Ms. Liu explained that as a young child she grew up talking and spending time with both of her parents in their beds while they relaxed and that she had continued with that family tradition when visiting her father, and treasured it all the more since she no longer lived with him.15
9. Ms. Liu’s father corroborated Ms. Liu’s explanation that in June 2023 he was prescribed dorzolamide eyedrops to treat his glaucoma which he administered in his bed twice daily until ceasing use in late March 2024

A little odd, but not unbelievable. There was also a point made that this medication would not help her compete in her field of artistic swimming and that the measured quantities were extremely low, consistent with it being absorbed through the skin. So on the whole it sounds like there's no real controversy here.