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Instant Index: Olympic Sprinter Tests Positive for Banned Substance

David Muir reveals the top stories that have people buzzing this week.
00:47 | 07/14/2013

Transcript for Instant Index: Olympic Sprinter Tests Positive for Banned Substance

Instant index this Sunday starting with the US Olympic sprinter and the test results that could end his career. -- -- -- tested positive for a banned substance he won't say it was a steroid. But he is... See More
This transcript has been automatically generated and may not be 100% accurate.
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