Former four division world champion Roy Jones Jr. is giving his support to UFC champion Jon Jones, who by some observers is regarded as the greatest mixed martial artist of all-time - while others believe there should be an asterisk near his name due to several drug testing issues. In 2016, Jones had tested positive for clomiphene, an anti-estrogenic substance, and letrozole, an aromatase inhibitor. Both drugs are on the World Anti-Doping Agency banned substances list, and are described as "hormone and metabolic modulators."
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