McEwen finished second at last year's US Championship
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US hammer throwers Melissa Price and John McEwen have both received two-year suspensions after being found guilty of taking banned steroid THG.
The US Anti-Doping Agency (USADA) announced the bans - the first for American athletes in the THG scandal - on Thursday.
"The decision confirms the work of all those who believe in drug-free sport," said USADA chief Terry Maden
Price's suspension began on 15 April, while McEwen's started on 19 April.
The panel concluded "the use of such a powerful anabolic steroid could be for no other purpose than to enhance an athlete's performance in violation of the spirit and absolute proscriptions of the IAAF 's doping rules."