(Image via Fightland/RyanLoco) A decision made during a California State Athletic Commission meeting in Los Angeles on Monday could have a major impact on the ongoing testosterone replacement therapy debate in MMA. Among the topics covered during the eight-hour session was a new proposed rule that would standardize the process for obtaining therapeutic use exemptions for testosterone. But the rule was successfully challenged by Department of Consumer Affairs lawyer Michael Santiago. As FightOpinion reports: [Santiago] said that until there is a statute/regulation on the books regarding testosterone that the commission should not be using an ”Ëœunderground‘ policy of approving T usage. He argued that testosterone is considered a banned substance. The end result is that fighters like Dan Henderson, Chael Sonnen, and Frank Mir will not be allowed to use testosterone while fighting in California until a law is on the books that explicitly spells out approval for T usage…[T]he UFC will be furious about this development given how many guys they have fighting in California who love testosterone. Vitor Belfort‘s sympathy plea for continued testosterone usage means he won‘t be fighting in California any time soon…