SAN FRANCISCO – A US federal court on Wednesday unsealed drug test results and a recorded conversation about US baseball star Barry Bonds that prosecutors say is evidence the home run king took steroids and lied about it.

Bonds is expected to plead not guilty on Thursday to charges of making false statements to a grand jury and obstructing justice. His trial is set to start on March 2.

Bonds, 44, passed Hank Aaron to claim the career Major League Baseball home run record. But his long-time team, the San Francisco Giants, declined to give him a new contract after the 2007 season, and no other team has signed the seven-time National League Most Valuable Player.

A federal grand jury in 2007 charged Bonds with lying when he testified in the BALCO lab steroid case that he had never knowingly used performance-enhancing drugs.

The lab's owner was imprisoned in that case, and professional athletes, including ex-track and field stars Marion Jones and Tim Montgomery, were disgraced in the scandal.

Prosecutors in a brief unsealed on Wednesday said federal agents found a coded BALCO ledger showing Bonds' urine tested positive for anabolic steroids three times in 2000 and 2001.

Handwritten notes from Bonds trainer Greg Anderson also indicated that Bonds and other athletes paid for performance-enhancing drugs, prosecutors said.

"The documents from Anderson's residence provide a detailed record of steroid distribution from Anderson to Bonds from 2001 to 2003, with entries referring to injectable steroids ('test 1cc'), human growth hormone, and other illegal performance-enhancing drugs," prosecutors said.

Bonds' lawyers, in a response that also was unsealed, said the government was linking Bonds to drug tests by "purported hearsay statements of Anderson."

Prosecutors in their brief included a transcript of a 2003 conversation between Anderson and a former associate of Bonds, Steve Hoskins, which Hoskins recorded. The expletive-filled transcript discusses drug testing, Bonds and injections. But neither man clearly says Bonds took steroids.

"There simply is no portion of what Anderson states in reply to Hoskins' questioning that unambiguously refers to Mr. Bonds," the defense brief says.

Neither mentions steroids in the conversation. Anderson says in the context of drug tests on basketball players, "everything that I've been doing at this point, it's undetectable."