In the case of Shayna Jack if I recall correctly one of the excuses it was blamed on someone in the Australian swimming organization giving her "by accident" the PED that was found in her system to claim how she was innocent. When they accuse Chinese swimmers, it because it's accused of being systematic by Chinese hence why all of them are considered guilty whether they tested positive or not. Someone in the Australian swimming authority gives their athlete a PED so they can say they didn't know it happened and no one assumes it's only just the one...? Michael Phelps was caught with marijuana in his system with no suspicion yet another US athlete in track and field did not go to the Tokyo Games because she tested positive for marijuana...
How will Phelps exclude himself from his one and done penalty? Because he didn't get caught before the Olympics...? I bet he will be against taking away medals retroactively.