Alan Keel, a DNAforensic scientist for the prosecution, has just linked Roger ClemensDNA to some of the medical waste stored in a crumpled beerby Brian McNamee for seven years.

The medical waste is the only physical evidence linking Clemens to the baseball doping scandal.

Keel, who is still testifying, said his lab found Clemens DNA on two cotton balls and at least one needle that had been used for an anabolic steroid shot.

McNamees DNA was found on wadded gauze that had blood stains, apparently from giving an injection.

McNamee claims he gave Clemens shots of performance enhancing drugs betwen 1998 and 2001.

Clemens claims McNamee gave him shots of vitamin B-12 and the pain-killer lidocaine but never performance enhancing drugs.

Clemens is accused of lying to Congress for sworn testimony in 2008 in which he denied that he had used the banned substances.

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Former trainer Brian McNamee arrives at the federal court in Washington, Monday, May 14, 2012. McNamee, Roger Clemens' chief accuser, testified Monday against the former pitcher, a make-or-break moment for the prosecution as it seeks to convict Clemens of perjury. (Susan Walsh / Associated Press)

Roger Clemens arrives at federal court for his perjury and obstruction trial on May 14, 2012, in Washington, DC. (Brendan Hoffman / Getty Images)

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Clemens’ DNA formally linked to needle