Passing a drugs test proves they did not take drugs that were screened for in that test

So... doesn't prove that drugs were not taken. Thank you for agreeing with me.

There is no logical and sound proof that Bolt has taken drugs.

As many people have pointed out, he has the money to do it and get away with it and all of his rivals are using. The drug tests are not good enough to cancel out the well-supported suspicion.

People have failed drug tests and shown not to have taken drugs.

False. You can show that a drug test gave a false positive, but there is no way to show conclusively that somebody has not taken drugs. Your failure to speak accurately is as bad as the other dummy.

Very far out of uni, but no surprises you're an American trying to belittle people to make yourself feel better.

You may be far out of uni. Many people both in America and in Europe don't remember shit that they learned in school. In the case of you and the other guy it is basic logic. Read up mate: https://rationalwiki.org/wiki/Affirming_the_consequent