Not to mention if a stable had recently had a positive wouldn't you be testing all of the winners coming out of that stable? Have a look at Military Step at Wanganui 14/1/2021 , was that 2 weeks after the positive?
9 winners that day ( I realise another one of TA was tested after winning, but isn;t that the point of the 6 race winners, the contamination can apparently come from anywhere) only 8 tested. They don't do the last race?