Tyson Gay, Asafa Powell, Sherone Simpson and Veronica Campbell-Brown have all tested positive for DRUGS, then.
Powell and Sherone Simpson have both been busted for taking Oxilofrine (ask Patrick Arnold). They both say that they did not take it intentionally, banking on the fact that it does appear in some dietry supplements. I don't know how testers prove or disprove this, but there must be some measure for deducing intention or not. There are a lot of very sophisiticated doping regimes, which are timed to perfection and mix a lot of designer steroids and stimulants in cycles to avoid detection at competitions, so I presume there is a larger story behind all of this. Three Jamaican sprinters suggests some larger design in Jamaican sprinting, so the next question is -- who is coaching them, where, and are they linked?
There has been a response along the lines of "don't tarnish Bolt with the sins of others." Well, as I said before, the burden of proof is against Bolt, not least because of the people he has chosen to work with. As I also mentioned last year, the idea that the Jamaicans are cleaner than the Americans is optimistic and ignorant.
At risk of being accused of racism again, this is almost the opposite of Chris Froome, who doesn't really have to defend anything, yet -- his record and his team say much. In this case, the burden is on those accusing.