I don't know if Bolt has cheated, but in history I can confirm that many drugs are discovered to be performance enhancing long before a test for them exists, and therefore it is clearly possible that Bolt has found a new form of doping that is as yet undetectable.
This is why samples are frozen and retained for years in case new techniques come on board that allow old drugs and doping techniques to be detected.
The sheer magnitude of the record breaking margin in this case makes it seem very odd that he should achieve it without cheating.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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