Veronica Campbell-Brown has been provisionally suspended from competition after she tested positive for a banned substance last month.
The world 200m champion tested positive for a banned diuretic on May 4 and is suspended pending her 'B sample' result.
Campbell-Brown now has to await the outcome of a disciplinary panel to hear the case and could face a two-year ban from athletics.
The 30-year-old has previously won the 200m at the 2004 and 2008 Olympics as well as taking bronze in the 100m at the London Olympics last year.
She has also won 16 medals for her country in world and Olympic meets and is the current 200m world champion, and would have been looking to defend her title later this year in Moscow.
When news of Campbell-Brown's positive test emerged, it came 48 hours after her compatriot, the 400m runner Dominique Blake, received a six-year ban for her second doping violation since 2006.
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