Can a person that is currently serving time in prison be used as the main witness or key witness for a separate case? Is their testimony considered sustainable evidence, although they gave there testimony due to a detective that forced them to do so? To based off of the "key witnesses" past criminal history and stated that if he wouldn't give him the story he was seeking, that he would have him arrested? The detective's testimony for the trial was impeached.
Of course they can testify. Likewise, their credibility can be called into question. A person's interest in a case, felony convictions, or convictions for crimes involving dishonesty (and more) are all valid areas for impeachment.
Yes, an inmate can testify. His credibility and veracity is a question for the judge or jury. You will need a good attorney to cross-examine him if he is the main witness and testifying against your position.
An person can testify. If they have a criminal record, those convictions may be used to impeach his testimony (for the jury to decide if he is believable). If he testimony is coerced based on threats, that can be brought out on cross examination for the jury to consider.
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