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Standard anti-doping tests look for different things than the CIR; if you were microdosing synthetic testosterone overnight you could pass a Testosterone/Epitestosterone ratio test in the morning which is looking for evidence of a change in your physiological response to a stimulant as your levels can drop back to normal very quickly.
CIR tests looks for the product itself which is a different ask, and is used to look at presence of any synthetic testosterone or steroids.
See also the Tom Danielson positive
The Compton one is odd. Apparently the initial sample came back clean, and was then re-tested following 'irregularities' in her biological passport. And if she's done AAS, then surely any basic test would find that? It therefore seems weird that the A sample was clean... Bit of a head-scratcher.
But I'm pleased that my cynical belief that pretty much everyone at the top level of elite sport is doing/has done something dubious is reaffirmed.