USADA announced today that Jamie Brown, of Oceanside, Calif., an athlete in the sport of Paralympic triathlon, has tested positive for a prohibited substance, which was determined to have been ingested by him without fault or negligence. As a result, Brown will not face a period of ineligibility for his positive test
“If an athlete ingests a prohibited substance from a completely innocent source, such as contaminated medication, meat, or water, and there is no effect on performance, there should not be a violation or a public announcement,” said Travis T. Tygart, Chief Executive Officer of USADA. “We have now had 26 of these tragic no-fault cases since 2016, and the injustice keeps happening. How many more athletes will suffer and resources will be wasted before we, as a WADA community, reform the system to be more fair, effective, and efficient?”
Press Release 29th October 2020 USADA announced today that Jamie Brown, of Oceanside, Calif., an athlete in the sport of Paralympic triathlon, has tested positive for a prohibited substance, which was determined to have been ingested by him without fault or negligence. As a result, Brown will...
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Oh, really?

You see, "injustice keeps happening".
I don't think you can really compare these two cases.
Brown's test was positive for a very commonly prescribed medication which has been at the center of multiple similar cases arising from contaminated medications and drinking water.
HCTZ is banned primarily because it (and other diuretics) are sometimes used in large amounts in attempts to cover up the presence of PEDs. It is also used by athletes in some of the weight-class sports (wrestling, etc) to try and rid their bodies of excess fluid in order to meet their weight class. This use is not relevant to the triathlon - so in Brown's case, HCTZ itself wouldn't have provided any performance benefit.
In fact, because contamination is so common with these particular drugs, WADA adjusted their rules regarding positive tests for diuretics last year. Urine tests positive for trace amounts of diuretics are no longer considered to be doping violations (
https://www.wada-ama.org/sites/default/files/resources/files/tl24_diuretics_eng_2021_0.pdf). This had been a topic of discussion for some years prior, and is part of what Tygart was referring to in saying Brown's case was an "injustice."
Also, Brown's test occurred outside of his sport's competitive season, so it didn't impact any ongoing competitions, and there was ample time for a proper investigation to take place before clearing him to take part in any future competitions.
Valieva tested positive for a comparatively uncommon medication that so far has not been linked to any lab-confirmed cases of contaminated food, water or other medications.
Trimetazidine is banned both in and out of competition because of the theoretical benefits it could provide with regard to cardiovascular endurance. As many have said - whether or not there is literature *proving* it has benefits is irrelevant. It has been unequivocally banned since 2014, and its presence on the banned list has not been at all controversial.
Her positive test came at the height of the competitive season - meaning that it could have impacts on at least three major competitions (RusNats, Euros and Olympics). Some have pointed out that she hasn't tested positive during the Games themselves - but if she was positive for a banned drug at the time of Nationals and was disqualified, then she wouldn't be at the Olympics in the first place.
There was also not enough time prior to the women's individual event to do a full investigation into what could have caused the positive test, other than intentional doping (whether or not Valieva had any knowledge of it) - so any possible explanations of how she could have accidentally ingested the drug are only theoretical until a full investigation can be done.
Based on the scant facts that are available now, it seems more unlikely that Valieva's case is due to accidental ingestion or contamination than in Brown's case, and because of the timing, it has more far-reaching implications.
I'll be interested to see what happens with her B sample - per WADA rules, a positive B sample is considered sufficient proof that a doping violation occurred, and the burden of proof that it was accidental would then fall to Valieva and her team.