Double jeopardy and similar crimes Suppose person A murders person B and is charged and tried for premeditated murder. If the jury finds them innocent of that charge, can the prosecutor then try them for, say, voluntary manslaughter? The murder part is just an example. I'm curious about the general case where someone allegedly committed multiple crimes in one act and was found innocent of one of them.
No, a later trial is not allowed A prosecutor can, and often will charge multiple related crimes, and all will be addressed at the same trial. But once a person has been acquitted on a given set of events, the same jurisdiction cannot re-try the same person on what is often called a lesser included offense. Nor on a greater offense implied by the same events. Not even if additional evidence comes to light. However, if an act (or set of acts) is a crime under both state law and Federal law, for example theft by deception (state crime) and wire fraud (federal crime) one jurisdiction may try the person even after ther has been an acquittal in the other. I think the same rule applies if an act is a crime within the jurisdiction of two different states, that both can trey the accused. In many cases prosecutors will choose not to bring the second trial, but they can if they see fit.
In the US this is generally governed by state law: RCW 4.24.350 in Washington state. The criminal jury is not empowered to make such a decision, but a separate civil trial for malicious prosecution would be possible. Plaintif (ex defedant) would have to prove that the action was instituted with knowledge that the same was false, and unfounded, malicious and without probable cause in the filing of such action, or that the same was filed as a part of a conspiracy to misuse judicial process by filing an action known to be false and unfounded The basis for the lawsuit would be the objective facts that prove that the prosecution was false and malicious, and not the fact of acquittal or the subjective opinion of a juror.
Your question is very broad, but yes, there innumerable ways that the actions of a victim/complainant can result in a not-guilty verdict. I'll list some. Contemporaneous consent to contact. If the victim/complainant consented to the contact, then the offence of assault or sexual assault will not have been committed. Self-defence. If the victim gave the accused reasonable grounds to believe that the victim was about to use force against the accused, then depending on the circumstances, it might not be an offence for the accused to take certain actions against the victim for the purpose of defending themself (the accused). The provocation defence that is based on conduct of the victim. See Criminal Code, s. 232, which can result in a not-guilty verdict for murder.
I don't think that simply failing to make a sufficient explanation of the risks would make a death manslaughter. Three would have to have been serious negligence in addition, rather beyond the level needed to find malpractice, as I understand the matter. Law.com says that: Voluntary manslaughter includes killing in heat of passion or while committing a felony. Involuntary manslaughter occurs when a death is caused by a violation of a non-felony [sic], such as reckless driving. The Wikipedia article on Manslaughter says that Involuntary manslaughter is the homicide of a human being without intent of doing so, either expressed or implied. It is distinguished from voluntary manslaughter by the absence of intention. It is normally divided into two categories, constructive manslaughter and criminally negligent manslaughter, both of which involve criminal liability. Constructive manslaughter is also referred to as &quot;unlawful act&quot; manslaughter. It is based on the doctrine of constructive malice, whereby the malicious intent inherent in the commission of a crime is considered to apply to the consequences of that crime. It occurs when someone kills, without intent, in the course of committing an unlawful act. ... Criminally negligent manslaughter is variously referred to as criminally negligent homicide in the United States, and gross negligence manslaughter in England and Wales. In Scotland and some Commonwealth of Nations jurisdictions the offence of culpable homicide might apply. It occurs where death results from serious negligence, or, in some jurisdictions, serious recklessness. A high degree of negligence is required to warrant criminal liability. ... An example is where a doctor fails to notice a patient's oxygen supply has disconnected and the patient dies (R v Adomako). Another example could be leaving a child locked in a car on a hot day
All Four of them! Double Jeopardy is not in play if a jurisdiction can lay claim to your criminal action, so if you stand on the Four Corners and shoot a man in any of the four states, each state has a right to charge murder. In addition, the Federal Government can have a go at you because you crossed state lines while in comission of a crime. Plus the Navajo Nation, which controls the reservation land the border is on. So that six separate charges. That said, the state the dead body occupied at time of Murder would have the best case for action and the other three would likely let that state try you first. The Feds would only step in if each of the four states failed to convict, though they can step in whenever they want (they are just watching to see if you'll serve time first). Not sure at which point Tribal jurisdiction applies, but given that this is a fairly common Jurisdiction issue, I'm sure it's been worked out.
In the USA, you must be found guilty "beyond reasonable doubt". As you describe it, I'd say there is an unreasonable suspicion of guilt, not guilt beyond reasonable doubt. If the magician killed three people that way, then three unexplainable deaths following three spells might get him convicted. A jury might say that even though there is no way to explain how the killing worked, the correlation might be enough to prove guilt beyond reasonable doubt.
Does he die from the poison or from the head injury? If it's from the poison, yes, Alice is guilty of murder. If it's from the head injury, Alice is guilty of attempted murder. If Bob dies from a combination of the head injury and the poison, Alice is likely guilty of murder. The general common law rule is that when there are two causes of death, liability attaches when the defendant's actions were a &quot;substantial factor&quot; in causing the death.
One wouldn't be able to make a claim about a driving record without it being testimony. Testimony will be challenged during cross examination. The prosecutor won't be able to bring up prior bad acts (such as previous speeding tickets) but will most certainly be allowed to rebut any claim of no prior bad acts made by a defendant. When the defendant claims a spotless driving record the defendant is introducing character or a character trait into the trial. Once introduced by the defendant the prosecutor will be allowed to challenge the credibility of that statement and, therefore, the credibility of the witness. Imagine the following interaction: Defendant: I have a spotless driving record. Prosecutor: Are you saying you've never been issued a traffic ticket? Defendant: Um, Uh, well... When a defendant goes to court they are facing a specific charge. The prosecutor will present evidence that supports that charge and it is up to the defendant and his attorneys to sow reasonable doubt within the jury, or at least one juror. By presenting character, the defendant may appear to be saying either, "Hey, it was my first time let me off," or, "I've never done it before so I couldn't have done it this time." Either way, it probably won't create reasonable doubt in the juror's mind about the specific charge they're weighing and it has the potential to open a can of worms that would be unfavorable to the defendant.