Interviews - For his entire career, Dan Henderson has competed at the highest level of mixed martial arts. And when it comes to competing at the highest level in sports, the question about performance-enhancing drugs always comes up.Being a former Olympic athlete, Henderson has a deeper perspective on drug testing than many other fighters.Dan Henderson recently talked about his view on performance-enhancing drugs and how he thinks the UFC is tackling the issue. Check out http://www.MMAWeekly.com's footag