GLASGOW 2014: Botswana 400m finalist fails doping test.
The A sample of Botswana’s Montsho, who finished fourth in the final, tested positive for banned stimulant methylhexaneamine.
A further test of the B sample will take place on Monday in London.
Montsho won Commonwealth gold at Delhi 2010 and the world title in 2011.
She won silver at the 2013 World Championships in Moscow, losing out on gold to Great Britain’s Christine Ohuruogu in a dramatic photo-finish.
Montsho told the BBC earlier this year that she would quit athletics after the Rio 2016 Olympics and aimed to become a basketball player.
A further test of the B sample will take place on Monday in London.
Montsho won Commonwealth gold at Delhi 2010 and the world title in 2011.
She won silver at the 2013 World Championships in Moscow, losing out on gold to Great Britain’s Christine Ohuruogu in a dramatic photo-finish.
Montsho told the BBC earlier this year that she would quit athletics after the Rio 2016 Olympics and aimed to become a basketball player.