Question something like inadmissable audio recordings and criminal prosecution / defense?

Okay, Joe is on trial for murder. Audio recordings of one of the prosecution's potential key witnesses have surfaced. They are inadmissable because (insert justification here). But, in the minds of the defense, these audio recordings discredit the witness, because they reveal his very flawed role (he is habitually dishonest in the tapes, and speaks of an auto robbery he himself committed in the past).

Question: even though the tapes are not admissible contained by court, can they be played for the judge in chamber, in the presence of both the defense and the prosecution?
Answers:
Has been a audible range on the admissibility of the tapes as evidence? If not, then how do you know the tape are not admissible? The job of the defense attorney is to discredit a prosecutorial witness and if the tapes contained by question speak to that then the attorney should submit a motion to enjoy them admitted. You're talking nearly a murder trial and the character of a witness is very defining to both the defense and the prosecution. There are lots of people in prison that own been convicted on the word of the questionable character of a witness.



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