Bolt's record-setting runs caused commentators not only to praise his achievements but to speculate about his potential to become one of the most successful sprinters in history. Critics hailed his Olympic success as a new beginning for a sport that had long suffered through high-profile drug scandals. The previous six years had seen the BALCO scandal, Tim Montgomery and Justin Gatlin stripped of their 100 m world records, and Marion Jones returning three Olympic gold medals. All three sprinters were disqualified from athletics after drugs tests detected banned substances in their systems. Bolt's record-breaking performances caused suspicion among some commentators, including Victor Conte, and the lack of an independent Caribbean anti-doping federation raised more concerns. The accusations of drug use were vehemently rejected by Glen Mills (Bolt's coach) and Herb Elliott (the Jamaican athletics team doctor). Elliott, a member of the IAAF anti-doping commission, urged those concerned about the issue to "come down and see our programme, come down and see our testing, we have nothing to hide". Mills had been equally ardent that Bolt was a clean athlete, declaring to the "Jamaica Gleaner": "We will test any time, any day, any part of the body... doesn't even like to take vitamins". Bolt stated that he had been tested four times prior to the Olympics, and all had tested negative for banned substances. He also welcomed anti-doping authorities to test him to prove that he was clean, stating, "We work hard and we perform well and we know we're clean".