Colombian cyclist Maria Lusa Calle Williams has become the latest Olympic
medallist to be thrown out for failing a drugs test.
The 35-year-old finished third in the women's points race on Wednesday but has
subsequently tested positive for the prohibited stimulant heptaminol.
Calle Williams has denied taking any banned substance but under the IOC's
'strict liability' rule she has now been stripped of her medal.
Her disqualification is good news for Erin Mirabella, who moves up from fourth
to become the United States' only track cycling medallist.
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