If it is about hormones, why then also not test for growth hormone (GH)? People with more than average GH might have longer legs, giving them an advantage in certain sports. There is also Adrenaline, Cortisone, etc. also giving certain advantages. Maybe we should try to cancel out ALL natural variations, to make the competitions more fair. In the end, we can only allow exact clones from each other to compete to each other. And end up with competitions which equal to throwing a dice, because nobody can be truly be “the best” anymore, which can be defined as “possessing the best set of natural variations that makes this person a born winner”.