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The National Rugby League and New South Wales Rugby League support warnings today from the Australian Sports Anti-Doping Authority about the stimulant&nbsp; Methylhexaneamine and the need for all athletes to remain vigilant in regard to the contents of any supplements or dietary products.<br><br>The NRL is unaware of any positive test to Methylhexaneamine in any of its finals matches, premiership matches or out of competition tests.<br><br>It has recorded a positive test to Methylhexaneamine at Toyota Cup level and a player is the subject of a provisional suspension until the matter is determined through the correct NRL and WADA procedures.<br><br>The NSWRL has today confirmed that it is also pursuing two cases involving the same substance at NSW Cup level and one at Bundaberg Cup level.<br><br>Further details in relation to individual cases are not available at this stage.<br>