Patrick Arnold, a chemist who worked with the Bay Area Laboratory Co-Operative, said in an HBO Sports interview that Barry Bonds and Gary Sheffield took performance-enhancing drugs provided to them by the laboratory. Bonds and Sheffield have denied knowingly using drugs provided by Balco, and told that to a federal grand jury investigating the laboratory, according to leaked testimony. Bonds remains under investigation over concerns about his testimony. Arnold is widely credited with creating ?the clear,? a previously undetectable steroid that Balco provided to athletes. In 2006, he pleaded guilty to conspiring to distribute steroids, and was sentenced to three months in prison and three months of home confinement. He was among five people convicted in the case. As part of his plea agreement, he did not have to name athletes and coaches to whom he supplied drugs.