Recourse for prosecution whose witness suddenly changes their story on the stand Say prosecution has a witness who saw the defendant do the crime and is happy to testify it on the stand. But when they take the stand, they suddenly surprise the prosecution by saying they did not see anything (thereby effectively commiting perjury). They may do it because the defendant has threatened them, or offered money, or whatever. A famous (though not real) example is Frank Pentangeli suddenly saying at the trial that he knows nothing about Michael Corleone's family (crime organization) in The Godfather Part II: In modern criminal courts, what can the prosecution do to fix that? Can they ask the court to adjourn the trial, talk some sense into the witness and have them on the stand again to tell the truth? If so, can the prosecution just carry on with other witnesses and simply bring the liar on the stand again another day, or does it necessarily need to advise the court immediately of what has happened and request an adjournment?
In U.S. practice, double jeopardy protections attach once the jury is seated and this scenario contemplates the change in position arising at trial. A mistrial could be called, or a continuance obtained, if the defendant suddenly claimed an alibi defense, since that amounts of a defendant waiver of double jeopardy protections. But without proof that the witness was tampered with, obtained at the last moment, it can be difficult or impossible to get proof of tampering or to contradict the story with other evidence to undermine the credibility of the witness. The prosecution would probably request a recess in the trial to regroup and try to admit evidence that the testimony changing witness made a prior inconsistent statement to impeach the testimony of that witness, from whomever that witness told the first time (probably a law enforcement officer). But this is still far less convincing to a jury than an affirmative statement from a witnesses about a key fact. If the prosecution could find evidence of defense side tampering and present it to the judge in the hours or small number of days before the trial ends, it might be able to get a mistrial declared. But it is much harder to get a mistrial for witness tampering when the witness shows up and testifies contrary to prosecution expectations than it is when the witness is, for example, killed or kidnapped and doesn't appear to testify at trial at all. But if evidence of neither type could be obtained before the jury was sent to deliberate and evidence was closed, and the jury then acquitted the defendant, it would be very hard for the prosecution to change this result. Perhaps not completely impossible, but very nearly so. The witness could be (and in this circumstance, despite the extreme rarity of perjury prosecutions, probably would be) prosecuted for perjury, but that wouldn't change the acquittal. If a link to the defendant could be found, the defendant could also be prosecuted for witness tampering or obstruction of justice or something similar. But that is hard to prove (and the witness would probably have to be convicted or provided with use immunity for his testimony) to do so. In English criminal law practice, in contrast, the likelihood of having the verdict of acquittal set aside and getting a new trial would be much greater (and the likelihood of getting a recess mid-trial would be greater in far more common bench trials in lower level criminal cases), but it would still be a serious burden for the prosecution that it might not be able to overcome. Lawyers aren't entitled to expect that witnesses will testify exactly the way that they discussed things with the lawyers before trial, and this can be explained away with a variety of excuses that are usually true (&quot;after thinking it over after meeting with you, I realized that I was confused and getting it wrong&quot;), but are sometimes a cover for a change of story that is not sincere. I've had similar things happen a few times in civil litigation and there is only so much you can do about it.
Possibly. I wonder if you mean "convicted" rather than "arrested"? There is no way that he will be "arrested" because you don't accompany him ("arrested" is when he taken by the police before a trial). On the other hand, if he plans to call you as a witness for the defence, then your absence may mean he is convicted at his trial when otherwise he would be found innocent. The final possibility is that you might act as a character witness after conviction, and your absence may mean he is sent to jail rather than fined. It may be possible for you to write a witness statement describing what happened, and to have this notarized. On the other hand, the prosecution may well want to cross examine you. I am pretty sure you can write a character witness statement (saying, if true, that it's a first offence and that you have forgiven him, etc) and get it notarized. That might persuade a court to be lenient. I think you (as a couple) need to talk to his lawyer.
Discovery Basically, you ask. If your opponent thinks your request is out of bounds they object, give their reasons to the judge, you give yours and the judge orders them to produce the evidence or not. A lot of people think court cases have big “ah-ha” movements when a witness reveals something unknown on the stand. This rarely happens because there are no secrets in litigation - both sides have to clearly explain their case before, usually well before, they go to trial.
When it is a mistake of memory, and not intentional (as this question is asking), there are no clear standards, and it is largely up to prosecutorial discretion. This means that whatever factors affect prosecutorial discretion (such as the prosecutor knowing who they have to work with on other days) can become significant in the determination. A prosecutor who announced this decision also specifically noted that it's up to the prosecutor to decide each case separately, with no guidance on fact patterns that could influence the decision either way. The Washington Post Magazine covered this question somewhat in depth several years ago, arriving at that conclusion. This was a surprise to me, but the article seems like a good resource on this - the question turns out to be more interesting and less resolved than it first appeared to be.
The California jury instructions for the crime of perjury give more detail on what it means to commit perjury: it's not just that you make a statement that is false, you have to willfully state that the information is true even though you know it is false. If you have a belief that you will be convicted for perjury (or any crime) by testifying, you may invoke your 5th Amendment right (I assume you are not testifying as the defendant in a criminal matter). You might (theoretically: see below on immunity and perjury) be granted immunity from prosecution, in which case there is no 5th Amendment right to refuse to testify (you are not putting yourself in criminal jeopardy), and the court can order you to testify. Or, you might not be granted immunity and still be ordered to testify. The federal immunity statute, 18 USC 6002, also needs to be scrutinized. When ordered to testify, "the witness may not refuse to comply with the order on the basis of his privilege against self-incrimination", but it generally cannot be used against him: no testimony or other information compelled under the order (or any information directly or indirectly derived from such testimony or other information) may be used against the witness in any criminal case However, there is an exception: except a prosecution for perjury, giving a false statement, or otherwise failing to comply with the order. In other words, you cannot be immunized against a perjury charge. In Kastigar v. United States, 406 U.S. 441 defendant refused an order to testify, on the grounds that they (allegedly) believed that the government's grant of immunity was not broad enough, i.e. that there were areas where they might be questions and forced to criminally implicate themselves. They refused, and were held in contempt. The opinion recognized that the 5th Amendment "protects against any disclosures that the witness reasonably believes could be used in a criminal prosecution or could lead to other evidence that might be so used" (emphasis added). In Mason v. United States, 244 U.S. 362, the court held that The Fifth Amendment does not relieve a witness from answering merely on his own declaration or judgment that an answer might incriminate him; whether he must answer is determinable by the trial court in the exercise of its sound discretion, and unless there is reasonable ground, as distinct from a remote or speculative possibility, to apprehend that a direct answer may prove dangerous to the witness, his answer should be compelled. Heike v. United States, 227 U.S. 131 asserts that "the constitutional protection is confined to real danger, and does not extend to remote possibilities out of the ordinary course of law, citing Brown v. Walker, 161 U.S. 591 (itself quoting Lord Chief Justice Cockburn): "the danger to be apprehended must be real and appreciable, with reference to the ordinary operation of law in the ordinary course of things; not a danger of an imaginary and unsubstantial character, having reference to some extraordinary and barely possible contingency, so improbable that no reasonable man would suffer it to influence his conduct" Although the wording of the immunity statute does not allow immunity from prosecution for perjury, the 5th Amendment right can only be invoked against a real legal jeopardy. They can be compelled to testify, they probably cannot be immunized against a perjury conviction (certainly not at the federal level). We would need to know the entire circumstances of the case to be able to assess whether the "knowing to be false" part could be proven beyond a reasonable doubt.
Information about a defendant’s character or past misdeeds are not generally admissible during a court proceeding. It can be brought in to rebut testimony. If the defendant takes the stand and asserts that they never discriminated against anyone due to their nation of origin, then evidence they they have done so becomes relevant.
united-states Witnesses are generally confined to giving testimony from their own personal memory; most of the time, they can't read a statement into the record or just tell the jury to go look at some other piece of evidence. But this creates problems when a witness knows an important fact but doesn't remember it when she takes the stand. Maybe she counted exactly how much money she stuffed in the robber's bag as she was doing it, and she wrote it down as soon as he fled, but a year later, she can't remember that it was $93,736.45. But the prosecutor isn't allowed to just give the witness a stack of evidence and let her go hunting through the documents to answer each question. Instead,he goes through the &quot;Do you remember&quot; colloquy to lay the necessary foundation to refresh the witness's memory, as contemplated by Rule 612, which then also triggers certain rights for the opposing party with respect to the document used to refresh the witness's memory.
How are such no-show-no-tell boundaries established They largely stem from the rules of evidence which are complicated, vary from state to state and knowing which is a big part of what litigation attorneys are paid for. Parties to litigation become aware of all the evidence/topics that their counterparts wish to broach in the courtroom well in advance — during discovery. They will usually disagree whether some bits and pieces can be presented to the jury. In this case the court will hold admissibility hearings — again, well in advance before the trial. Despite all the preparations, some of these disagreements arise during the trial, and then they are resolved in place by way of voiced objections. The attorneys and the judge talk about them using professional jargon of the rules of evidence — having themselves seen all the evidence in advance. does the jury get to know them No, the jury doesn't need to follow the professional talk. In fact, they should hear as little as possible of it — which is the reason why admissibility disagreements are resolved in advance as much as possible. If serious issues arise during the trial, the judge will ask the attorneys to speak to them in chambers — away from the jury. Or they will ask the jury to take a break while the professionals talk. The jury just needs to listen to the evidence that is allowed in, and disregard any evidence the judge say they have to. is this also in the public record somehow? It is in the court record. It may be accessible to the public if the court allows. If someone wishes to see the record they need to apply to the court, provide reasons and a judge will decide if anything can be released.