Bolt was just as surprised as all of us about how fast he ran . Test Usain Bolt all you want . There wo n't be any illegal substances in his body . Not only do I believe he is clean , he has to be clean .

Question: Why would some doubt Usain Bolt 's integrity ?
Answer: He was caught with substances that are illegal .None of the above choices .He runs so fast .He was in possession of illegal drugs .