The World Anti-Doping Agency (WADA) is issuing a modified version of the 2004 List of prohibited methods and substances. The changes, which do not affect the substances currently on the List aim at preventing any legal loophole in case of the discovery of a new designer steroid. The discovery of the designer steroid, Tetrahydrogestrinone (THG), has made clear that the definition of analogue as defined under sections S4 and S5 of the former List is inappropriately restrictive.
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