Could jury instructions reasonably be viewed as a kind of expert witness testimony? It seems to me that jury instructions could be viewed as a kind of testimony provided by an expert witness (the judge) about what verdict must be returned based on what facts the jury finds to be true. Like witnesses, judges are human and subject to biases and external pressures, and it seems like it would be reasonable to assume that their jury instructions could reflect that. Viewing jury instructions this way I think would mean that it is part of the role of the jury to determine which parts of the jury instructions should be considered fact, and I think it would also mean that jury nullification wouldn't necessarily mean that a jury returns "a verdict of 'Not Guilty' despite its belief that the defendant is guilty of the violation charged"; it could just mean that the jury doesn't accept all of the statements in the jury instructions, such as the judge's interpretation of the law, as fact. Could jury instructions reasonably be viewed as a kind of expert witness testimony? If not, what are the main problems with viewing them this way?
No. There is a clear distinction between: evidence (or testimony), which consists of statements of fact given by witnesses on oath (subject to prosecution for perjury), governed by the rules of evidence, and which the jury is required to consider but not accept (in the sense that a verdict which is not supported by the evidence can be set aside on appeal), submissions, which consist of argument by the lawyers for the parties, which the jury is not required to consider or accept, and directions, which consist of statements of law given by the judge, which the jury is required to accept. The jury is required by its oath to follow the law as stated by the judge, even if it is wrong. The remedy for erroneous trial directions (an appeal) is different to the remedy for erroneous evidence (a perjury prosecution in the case of deliberate lies; nothing in the case of innocent errors). Because the jury has the power, but not the right, to nullify a charge by disobeying the judge’s directions, there is a sense in which the jury is free to reject the judge’s directions just as it is free to reject evidence. However, this is completely inconsistent with the theory that defines the roles of judge and jury. There is no legal basis for viewing judicial directions as a kind of expert testimony. ‘The power, but not the right’ Obie 2.0 asked about this phrase. It coems from the Case of the Dean of St Asaph, which is reported at R v Shipley (1784) 4 Doug 73. The relevant passage is summarised in Lord Devlin's Trial by Jury (1956), at p 87: Jury’s Power of Acquittal There may well be cases in which the killing is not in doubt and the formal direction not to return a verdict of manslaughter is therefore tantamount to a direction to return a verdict of Guilty. Still, if the direction is ignored, the court must, I think, accept the verdict. There is no way in which a verdict of acquittal can be nullified. As Lord Chief Justice Mansfield put it in 1784: “It is the duty of the judge, in all cases of general justice, to tell the jury how to do right, though they have it in their power to do wrong, which is a matter entirely between God and their own consciences.” Mr. Justice Willes said: “I admit the jury have the power of finding a verdict against the law and so they have of finding a verdict against evidence, but I deny they have the right to do so.” The Chief Justice of Australia held to similar effect in Gammage v The Queen (1969) 122 CLR 444, writing: [The jury] have no right, in my opinion, to return a verdict of manslaughter where they are satisfied of murder. But, as I have said, persistence by them in returning another verdict must ultimately result in the acceptance of that verdict. In that sense, but in no other sense, it is both within their power and, if you will, their privilege to return a wrong verdict. To answer Obie 2.0's question, the jury has the power to ignore the judge's directions, because – at least at the time Lord Devlin was writing in 1956 – a verdict of acquittal could not be nullified. However, the jury does not have the right to do so because the law requires it to follow the directions. As Ed999 observes, the law governing jury trials does vary between jurisdictions. In particular, some jurisdictions (which lack the United States' constitutional double jeopardy clause) now allow for a jury acquittal to be set aside on appeal. However, the fundamental distinction between a witness’s evidence and a judge’s directions was established in England centuries ago, and remains applicable throughout the common law world. It is worth specifically mentioning the United States because jury nullification remains a controversial topic in that jurisdiction. However, the basic principle that the jury is legally required to follow the judge’s directions was established in Sparf v. United States, 156 U.S. 51 (1895), and described by Ginsburg J (albeit in a dissenting judgment) as ‘conclusive’ in Honda Motor Co. v. Oberg, 512 U.S. 415, 447 (1994). In Sparf, the opinion of the court was: We must hold firmly to the doctrine that in the courts of the United States it is the duty of juries in criminal cases to take the law from the court and apply that law to the facts as they find them to be from the evidence.
It seems like the officer should have to present at least some kind of evidence that the alleged crime occurred. Testimony is evidence. Officers can and do abuse this, but courts tend to give them the benefit of the doubt, so they typically attribute greater weight and credibility to a police officer's testimony than to that of a defendant.
canada When faced with improper statements made in front of a jury, the judge has three options: provide a correcting instruction to the jury, to strike the jury and continue alone (in civil matters), or to declare a mistrial. Mistrial would be the appropriate remedy if the effect of the statements is so improper and prejudicial that it cannot be corrected by the judge's instructions to the jury to ignore them. See e.g. R. v. Armstrong (1969), [1970] 1 C.C.C. 136 (N.S.C.A.). A witness made an improper reference to an accused's confession. The only effective remedy was a mistrial. Whether this is the case is a matter of discretion left to the trial judge.
The situation you describe is extremely unlikely First, you will have been required to give a statement to the police who would have asked you most or all of the questions that you suggest before anyone gets anywhere near a courtroom and likely before any arrest has been made. That statement will be part of your evidence in chief. As in &quot;Is this your statement?&quot; &quot;Yes&quot;. &quot;Is this your video recording?&quot; &quot;Yes&quot;. After that, your evidence in chief is pretty much done. A witness of fact (rules for expert witnesses are different) can only testify as to what they personally sensed and what their state of mind was. So questions about what you saw, heard, tasted etc. are all perfectly legitimate as are questions about what you thought or felt. You are required to answer these questions honestly - if that means &quot;I don't know&quot; then say &quot;I don't know&quot;. All of the hypothetical questions look fine but as I said, they will all have answers in your police statement. The only one that's off-limits is &quot;&quot;Do you feel that a crime has been committed?&quot; - nobody knows if a crime has been committed; that's why we're having a trial.
Such things are in fact legal in some US jurisdictions, as part of plea bargains. In fact such pleas are not uncommon. More usual is the case where a person pleads guilty to a lesser crime, so as to qualify for a lower sentence, when all involved know that the lesser crime was not committed by anyone. It is simply a device to get a compromise sentence and avoid a trial. In some jurisdictions the Judge, in the course of accepting a guilty plea, requires that the accused admit specific facts that form a minimal legal basis for conviction of the crime pled to. In others no such admission is made. But even where such an admission is made, the truth of such an admission is not usually checked. The Judge will generally make sure that the accused understands the effect of a guilty plea, the rights given up by such a plea, and the possible range of sentences that will result. If the Judge believes that the plea constitutes a miscarriage of justice, for example that a totally innocent person is yielding to improper pressure from the prosecutor, the Judge can refuse the plea, but this is very rare in practice.
Are defendants legally obliged to provide all culpatory evidence to prosecution? The question here is whether or not all evidence requested by prosecution must be provided by the defense? If the defense plans on only using the evidence of the prosecution, does the prosecution get to demand evidence the defense would rather not release? No. Usually only specific kinds of evidence related to specific kinds of claims such as alibi evidence, an insanity claim, or expert testimony must be disclosed prior to trial by a defendant in a criminal case. A defendant in a criminal case does not have to disclose evidence harmful to the defendant's case prior to trial as a general rule. Sometimes there is a requirement to disclose witnesses anticipated to be called, or exhibits to be possibly used very shortly prior to trial, but that is more the exception than the rule. Does the answer depend on the whether or not the case is criminal or civil? Yes. A plaintiff in a civil case can compel disclosure prior to trial of all evidence in the custody, control, or possession of the defendant that is relevant or is reasonably calculated to be relevant to a disputed issue identified in the complaint, answer, and other pleadings (e.g. counterclaims, replies to counterclaims, third-party complaints, cross-claims, etc.). The scope of discovery is slightly different in jurisdictions that don't follow the federal model. This can include pre-trial depositions of the parties, although a defendant can claim the 5th Amendment at the risk of being exposed to an adverse inference communicated to the jury at trial if the defendant does so. Furthermore, most jurisdictions require the pre-trial disclosure of expert testimony that will be used at trial, of exhibits that will or may be used at trial, of witnesses who will or may be called a trial, of all documents that are relevant to a disputed issue identified in the complaint, answer, and other pleadings, of all insurance coverage that could cover the claim, of all persons with knowledge of the disputed facts, and of an expected damages calculation. In the federal system, however, one need pro-actively disclose only witnesses and documents that support your case without being asked. Is there consistency on this or is it at the discretion of the judge? The rules of procedure applicable to a case govern the scope of discovery, but judges have considerable discretion to determine that requests are excessive relative to what is at stake in the case, are irrelevant, or unduly burden some other legitimate interest of the person subject to discovery. Is there punishment for non-compliance? Yes. First of all, a failure to disclose when there is a duty to do so is a ground to exclude presentation of that evidence at trial. Secondly, in civil cases, attorney fees incurred to obtain the discovery can be awarded, facts that might have been disclosed can be declared to be true as a matter of judicial sanction where there is not disclosure, claims can be dismissed, etc. The main relevant federal rule in civil cases is Federal Rule of Civil Procedure 37. It is an unlawful request that must nonetheless be followed with only a hypothetical remedy left to the defendant as is the case in most of these united states to comply with an obviously unlawful arrest that doesn't present an immediate threat to life? I don't understand this long and convoluted sentence. The part about an unlawful arrest seems divorced from the issues in the rest of the the question. It isn't clear what kind of unlawful request is involved either.
Special regimes For some kinds of questions there are special presumptions or forms of evidence that are specified by statute. For example, in Canada and the United States, registering a copyright creates presumptive proof that the copyright exists and is owned by the registrant. In Canada, breathalyzer results are conclusive proof of the blood alcohol concentration if certain conditions are met. Some of these regimes are not subject to challenge: they are legal facts even if they are not objectively true (e.g. the breathalyser results). Others create presumptions that can be overcome by contrary evidence (e.g. copyright ownership). The default: present relevant evidence, including testimonial evidence But outside of special regimes, you prove a fact by introducing evidence. The default is that all relevant evidence that bears on a material fact is admissible. Evidence is relevant when, if is were to be accepted, it would make the fact in issue more or less likely to be true. Evidence comes in many forms: testimony of the parties or witnesses, documentary evidence, physical evidence, expert opinion evidence. If you are wondering, &quot;How do I prove X?&quot; Ask yourself, why do you believe X? Or, how do you know X? Or, how has the event X left its mark on the world? Whatever has led you to believe X probably is the evidence that you would want to introduce to the court to help prove X. Perhaps you saw X: you can tell the court you saw X. Perhaps you took a photo of X: you can present that photo in court. Perhaps you have a receipt for X: you can show that receipt in court. Perhaps X is a proposition about your own actions: you can tell the court about those. Obtaining the evidence Evidence can be obtained from the other party during the discovery process, or from third-parties using subpoenas, subject to objections relating to relevance or privilege. Not all (potentially) relevant evidence is admissible However, some evidence will be inadmissible despite it being potentially relevant. I will only present a few categories, some very general and some more specific: hearsay (unless it falls within an exception to the hearsay exclusion), privileged material (unless it is a case-by-case privilege or a discretionary privilege and the person seeking to admit the evidence demonstrates to the judge that it should be admitted), sexual history evidence of a sexual assault complainant when it will be used to support an inference that the complainant is more likely to have consented to the sexual activity that forms the subject-matter of the charge or is less worthy of belief (this is because it has been recognized as not relevant for this purpose), material that was obtained in contravention of the Charter and where the court has decided that the remedy for the Charter violation is exclusion of the evidence (in the United States, there is stricter, exclusionary rule), there are many more. There are also some meta-rules about the evidence that may be used to impugn a witness's credibility, themselves at trial to provide evidence, but for now I am leaving those out of this fairly summary answer. Weighing the evidence The trier of fact (the judge or a jury) then is to weigh all the admissible evidence, including by weighing the witness and party testimony according to its credibility and reliability after testing through cross-examination, to come to a conclusion on the ultimate question(s) at issue.
Yes. Opening statements and closing arguments are part of the record, but they are not evidence on the merits of the case. Courts often cite them in their rulings on various issues, especially because they are strong indicators of a party's theory of the case and what the jury was being encouraged to consider when rendering a verdict.