As the Roger Clemens trial grinds on, there are several developments (which we will try to document).

Today a forinsic expert testified that DNA (and here)found on equipment used for steroid injections retained  by the trainer, McNamee

A forensic scientist testified that two cotton balls and a syringe needle allegedly saved after a steroids injection tested positive for Roger Clemens’ DNA, a key moment on Friday as the government tries to prove the former pitcher used performance-enhancing drugs.

Alan Keel told jurors that the DNA on both cotton balls were “unique to one person who has ever lived on the planet” – Clemens. He said one of the cotton balls had a random match possibility of one in 15.4 trillion for Clemens’ DNA, and the other had one in 173 trillion, when comparing to the population of white people in the U.S.

Both cells and blood were 'matched' from the discarded cotton balls and syringes containing PED substances, with Clemens' DNA.

Experts testified that the medical waste contained traces of 'roids.  Thus there is a tenuous link betweem Steroids and Clemens on physical evidence, that appears to corroborate the oral testimony of Clemen's trainer Brian McNamee (below right) about the Rocket's use of the PEDs.

Obviously questions remain, as this is not a forensic sample, about the links among the bits of evidence that Clemens deceived others about his steroid and PED use.

 On Thursday, two forensic analysts said they had found steroids on the items, some of which included needles, gauze, and a broken steroid ampoule that had been stuffed into a Miller Lite beer can. Clemens attorneys have already indicated they will argue that there is no way to tell how steroids got onto items connected to the pitcher. They countered on Thursday that someone may have dripped steroids over the medical items and that chemicals in the batch of evidence could have mixed together, making it hard to tell whether steroids were on items connected to Clemens. McNamee admitted last week that some of the medical waste was from other players.