Hunter Biden's former girlfriend testified about his crack cocaine use in luxury hotels before 2018 gun purchase, questioning his honesty about addiction.
Kathleen Buhle, his ex-wife, recounted discovering his drug use, adding weight to prosecutors' case.
Prosecutors aim to call Hallie Biden, Hunter's late brother's widow, as a witness in the trial.
Defense argues Hunter Biden was clean during gun purchase and did not intend to deceive, FBI evidence questioned by lawyer.
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