GENEVA, June 10 (Xinhua) -- The Court of Arbitration for Sport, world sport's highest court, has reinstated Olympic medals for two Belarusian hammer throwers, saying their doping tests were invalid.

The CAS says doping tests of Vadim Devyatovskiy and Ivan Tsikhan are invalid because international laboratory standards were not respected. It says the medals should be returned.

Devyatovskiy and Tsikhan won silver and bronze medals, respectively, at the 2008 Beijing Olympics.

They tested positive for elevated testosterone after the hammer throw final. They were disqualified and stripped of the medals by the International Olympic Committee.

The athletes denied doping and appealed to CAS.

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