A transcript of testimony at the preliminary hearing is admissible at trial if the witness in question is unavailable to testify.

Question

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This is known as the "hearsay exception for prior testimony." If the witness is unavailable for trial, their prior testimony given at the preliminary hearing (or another hearing) can be used as evidence. However, there are certain requirements that must be met for the prior testimony to be admissible at trial.

A Transcript of Testimony at the Preliminary Hearing Is Admissible