Final answer:
The last chance to question a witness in a trial is during cross-examination; it's a fundamental right protected by the Sixth Amendment and serves to verify the credibility of testimony.
Step-by-step explanation:
The last opportunity for questioning a witness occurs during cross-examination. Cross-examination is a crucial phase of a trial where the opposing side has the chance to challenge the credibility and reliability of the witness's testimony. The Sixth Amendment guarantees the right to confront and cross-examine witnesses presented by the prosecution to ensure the defendant's ability to build a defense. Faulty eyewitness identification and testimony can lead to wrongful convictions, making the process of questioning witnesses very important to the integrity of the legal system. Adjustments in questioning techniques and awareness of witness suggestibility have been implemented to improve the accuracy of testimonies.