Genetic Modification

As of April 2015, at least, there's no hard evidence that gene doping has been used for performance enhancement yet. That data is from two years ago, more than two years ago now. So what else could have happened? Do you think it'd be harder or easier to detect even? How would you even screen for it in the way that you would, like with a blood or urine test for steroids or human growth hormone or something? You know what I mean? Because for me, I always thought of genetic modification as something that occurs in utero. Yeah. Early on before you become a human.