get this..
Usain's preparation for the 100m final and semi final was...sleep in, watch tv, eat some chicken nuggets, sleep, get some more chicken nuggets, then go to the track.
he was tested 32 times in the last 3 months. and his blood has been stored for retrospective testing also. If he tests positive he'll be lynched in jamaica and his family will suffer humiliation beyond belief.
He has no incentive to use. the guy's a machine.