Barry Bonds is trying to clear his name. He ended his career as baseball’s all-time home run leader, but a perjury trial and steroid accusations have tarnished his image.

Bonds is seeking to exclude from his perjury trial next month a secret recording made by a former business partner that allegedly discusses his steroids use.

The hearing began Thursday morning in San Francisco federal court. Bonds’ trial is scheduled to begin March 21.

The recording was made by Stevie Hoskins in March 2003. Prosecutors say it is a conversation between Hoskins and Bonds personal trainer Greg Anderson. Anderson can be heard discussing an undetectable substance he appears to have given Bonds. Prosecutors allege Anderson is talking about a designer steroid they say showed up in a Bonds urine test.

Bonds’ attorneys want to exclude the recording from the trial because of Anderson’s refusal to testify at the trial. They argue the tape can’t be authenticated without Anderson’s testimony.

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