Usually, witnesses are issued a subpoena and they come of their own means.
If a witness does not want to appear, law enforcement can be directed to bring the witness.
the final round of questioning of a witness in a trial
Yes, the defendant can serve as a witness in the trial, but they are not required to do so.
It depends on why the witness is not there, what kind of witness it is, what kind of case it is, and what sort of evidence the witness is expected to give. In a criminal trial, the case may be dismissed if there is no witness. Or the trial may be delayed while law enforcement finds and brings the witness to court (if they are ignoring a subpoena). If the witness is ill or travelling, the case may be continued to wait for the witness. If the witness is not key, the parties may proceed without him/her, or they may shift around the order or witnesses to allow that witness to appear later in the trial.
Are you asking about a witness?
On Trial - 1956 Strange Witness - 2.5 was released on: USA: 3 August 1959
In a bench trial, yes. In a jury trial, this is up to the jury.
a fair trial
The final round of questioning of a witness in a trial
a witness
On Trial - 1956 Strange Witness 2-5 was released on: USA: 3 August 1959
On Trial - 1956 The Fourth Witness 1-11 was released on: USA: 21 December 1956
If a witness says "I don't recall" in court during a trial, it may weaken their credibility and the strength of their testimony. This could impact the outcome of the trial as it may raise doubts about the witness's reliability and the accuracy of their statements.