By Tom Schoenberg - 2012-05-25T16:42:02Z

Roger Clemenss genetic material was found on medical waste that his former trainer turned over to federal investigators, a DNA analyst testified at the perjury trial of the ex-New York Yankees pitcher.

Alan Keel of Forensic Science Associates, a California consulting firm, told federal court jurors today in Washington that he found Clemenss DNA on two cotton balls and a syringe. The former trainer, Brian McNamee, left blood on a piece of gauze and pus on a piece of tissue, Keel said. McNamee said earlier he might have cut himself breaking the top of an ampul.

The amount of Clemenss DNA found on the syringe was about six to 12 cells, Keel said.

A very small amount of biological material was recovered, he said.

Keel, a prosecution witness, agreed with Assistant U.S. Attorney Courtney Saleski that a small amount is not unusual for an intramuscular injection.

Clemens, a seven-time Cy Young Award winner, is charged with one count of obstructing a congressional investigation, three counts of making false statements and two counts of perjury stemming from his testimony to a House panel investigating the use of performance-enhancing drugs including steroids and human growth hormone.

The ballplayer faces as long as 21 months in prison if convicted. He denies having used the drugs. The government is trying to prove he used them and lied about it to Congress.

The prosecutions evidence includes the needle and cotton with Clemenss DNA that tested positive for anabolic steroids, prosecutors said. The material came from McNamee, who said he saved needles, gauze and vials from one of the injections in 2001. He told jurors he kept some of the items in a Miller Lite beer can that he took from the recycling bin in Clemenss apartment.

McNamee has testified that he gave the ballplayer injections of steroids and HGH during the 1998, 2000 and 2001 baseball seasons while both men worked for the Toronto Blue Jays and the Yankees.

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Clemens’s DNA Was on Syringe, Cotton Balls, Witness Says