A forensic scientist took the stand Friday in the Roger Clemens perjury trial, providing key testimony for the prosecution.
Alan Keel told the jury that two cotton balls and a syringe needle allegedly saved after a steroid injection tested positive for Clemens' DNA.
Clemens' former strength coach Brian McNamee testified that he saved the medical waste after injecting the pitcher with steroids in 2001.
The defense says it will not contest the evidence.
Meanwhile, the trial could be losing another juror.
The mother of juror number 16 has died.
Two other jurors were dismissed for sleeping.