Are there doping controls after NCAA finals?
Mmmmm ostensibly? I've heard it has historically been pretty hit and miss.
But assuming he was tested, the NCAA is not under USADA's umbrella and doesn't necessarily do all the same tests they do or even have all the same banned substances. My guess is that NCAA tests cover basic steroids, street drugs, and some stimulants. But more importantly, the NCAA does not share information with USADA, and they spend many months going through some process with positive tests. If an athlete failed a test at NCAAs, it would not keep them out of the Olympics, and we would most likely never hear about it at all.
Brazier has never been tested by USADA. They don't have any sort of biological passport baseline on him yet. And he just became a USATF member yesterday, even if USADA had wanted to test him earlier this year they couldn't have.
But I'm not trying to throw shade on Brazier, he is obviously an extremely talented athlete who had an incredible season and I have zero reason to believe he is anything less than squeaky clean.
I am trying to highlight some extreme flaws in anti-doping within the US. We like to look down our noses at Russia, Kenya, Jamaica, etc, but there are some pretty big holes and loopholes in our system.