Let’s look at your very 1st part of this—why if she passed the pre-comp testing would passing additional tests be an issue? One possibility—and seems likely so labs don’t get overwhelmed trying to do thousands of athlete blood tests in a short span—is that the initial testing was just testing urine, but medalists and random selected get blood testing as well which would reveal more, including biopassport alarms.
That's a very good question: Does pre-comp testing for major events involve
both urine & blood samples for athletes who are part of the ABP? No question Fraser-Pryce is part of ABP specifically for monitoring of the steroidal & hormonal modules. So, would they have taken a blood sample along with a urine sample?
Looking back at the 2012 London games, disgraced 800m gold medalist
Mariya Savinova was part of the ABP & only a urine sample was obtained pre-comp. And the only blood sample obtained from her during the entire Olympics was on the day before prelims. According to the
McLaren report, she used EPO & Anavar in the lead-up to the Olympics.
Her teammate,
Natalya Antyukh, the disgraced 400mh gold medalist, had no blood samples taken at all for her ABP. According to McLaren, she was using the infamous
"Duchess Cocktail" in the lead-up to the games (which entails 3 anabolic steroids taken with a slug of Vodka for better absorption. Lol).
No evidence of IC doping with any of these athletes. And they only got caught because of the whistleblower who came forward about the Russian state-sponsored dopng program (a disgruntled female 800m specialist who didn't make the Olympic team. Lol).