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This is possible if they invent a hypothetical "instant" doping method – take it and you're good to go.
No, I was rather thinking about doping being used during training. Strictly speaking, there's no guarantee that an athlete took doping before the competition, and not during training throughout the competition period, which also takes place. Although that would be stupid and wouldn't have time to take effect, but...
And in reality, they don't find the doping itself, but traces of its breakdown. Otherwise, they would find it in 100% of cases while it's still in the body.