One other scientific point. Half-life is a basic determinant of how long an agent will stay within the bloodstream/body systems. In nuclear medicine, we always used the rough estimate of 4 half-lives for the 6-hour half-life agent technetium (IOW, 24 hours) after which its pretty much gone. For most drugs, their concentration needs to reduce to 5% or lower for the concentration to be considered negligible, and roughly 4 to 5 half-lives will accomplish this. That earlier post with the estimate of 24 hours was a good estimate for this drug to have disappeared from Bobrova's bloodstream.
HOWEVER, many things affect drug elimination. Route (eg, kidneys vs GI), state of hydration, and especially the person's own metabolism and any other illnesses/conditions they have that may slow down elimination. This is why, for example, that you try to avoid drugs eliminated through the urine in patients with chronic kidney disease. We don't know how Bobrova received the drug in regards to whether she took it on her own or it was administered to her with or without her knowledge. That said, whoever did administer it may have miscalculated or believed the drug was gone after a reasonable period of time, yet it turned out it wasn't metabolized that fast.
I will state, though, that the concept of rival team sabotage (I'm interpreting that article as meaning non-Russian teams) or one lab actually testing ALL these athletes with off-kilter analyses as having a pretty remote chance of actually happening. But if it did, I want a portion of the movie rights...