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Thiago Silva's urine sample in question

Updated: March 29, 2011, 6:14 PM ET
By Josh Gross | ESPN.com

UFC light heavyweight Thiago Silva "submitted an adulterated and/or substituted urine specimen" as part of a drug screening in Nevada leading up to his fight with Brandon Vera on Jan. 1, a complaint filed by the Nevada State Athletic Commission against the fighter alleges.

The urinalysis reflects a "complete-invalid result indicating that the specimen by Silva is inconsistent with human urine," according to the complaint's factual allegations, which were released Tuesday by the commission.

Silva's ...

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