Credibility and bias.
In Devil's Advocate, Barbara, a high school girl, testifies in court:
Defense: Have you ever had a party at your house, Barbara, when your parents were away?
Prosecution: Objection. Your Honor, this is way out of line.
Defense: Credibility and bias.
Judge: Overruled. Answer the question.
Any chance you could explain to me what "Credibility and bias" means? It's just not clear to me who's (not?) credible or biased here.