LONDON - Former world 400 metres champion Amantle Montsho's positive dope test at the Commonwealth Games in Glasgow was on Friday confirmed by the Games Federation (CGF). The high profile Botswanan athlete tested positive for the banned stimulant methylhexaneamine after a struggling fourth in the 400m final in Glasgow. A CGF statement confirmed: "On 29th July a test during the Commonwealth Games produced an adverse analytical finding indicating the presence of Methylhexaneamine Dimethlypentaylamine - a substance prohibited under the current WADA Prohibited List - Class S6 Stimulants. "Ms Montsho requested that her B sample be analysed, which subsequently confirmed the initial A sample analysis. "The results of all her performances at the Games will now be nullified."–AFP